when is it less likely for me to get pre

Just like pascal said, those calendars are not accurate. Every woman’s cycle is different and the only way to know what is going on during your cycle and when you are ovulating is to kinda turn scientific. It’s called Fertility Charting. Though most couples use it to detect when their peak time to get pregnant is, it can also be used in the adverse way.

Here is more information: In the first part of the menstrual cycle estrogen levels slowly increase. Increasing estrogen prepares not only the ovarian follicle (from which the egg will emerge) but also causes changes in a woman’s cervical mucus. Gradually the mucus changes in character from dry through sticky to a creamy and then finally an egg-white or watery consistency. This watery substance is the perfect sperm friendly medium and it allows easy passage of living sperm to the uterus. As estrogen levels drop in the second half (or luteal phase) of the cycle the cervical mucus will again become more hostile to sperm. One line on your fertility chart ) can be devoted to charting the characteristics of cervical fluids.

Progesterone, on the other hand, while low in the first part of the menstrual cycle peaks after ovulation. Progesterone prepares the uterine lining to receive a fertilized egg. Progesterone also increases basal body temperature so if we track that temperature and we see it has gone up and stays up we can reasonably well infer that ovulation has occurred. Thus a clear fertility chart can help you instantly understand what is happening with your body.

A third change that occurs every month is the position of a woman’s cervix. When a woman is most fertile, her cervix tends to be higher and softer in character. One line of your fertility chart will be devoted to recording cervical position.

To this information we can also add a little technology in the form of ovulation predictor kits. These readily available urine testing devices measure the amount of lutenizing hormone (LH) present. LH is responsible for the final maturation of the egg and peaks just before ovulation occurs. The information you gain from these simple home tests is then recorded on your fertility chart.

Putting all of this information together allows a couple to reasonably track when they may be most fertile. Many people have found that the easiest way to keep and understand all this data is in the form of a fertility chart.

How to chart You will need a thermometer capable of showing you the relatively small changes in basal body temperature that are seen throughout the fertility cycle. There are glass thermometers made just for this purpose which are marked in very small increments. Even easier is one of the readily available and inexpensive oral digital thermometers.

To take a basal body temperature it is important that the woman is well rested, that the temperature is taken before doing anything else in the morning (do not get out of bed) and that the temperature is taken at approximately the same time every morning. This is a resting body temperature. Getting up, moving around, emptying your bladder will all artificially raise your temperature reading and interfere with your ability to keep an accurate fertility chart.

If you are using an ovulation prediction device you will check your urine on the prescribed days (varies from device to device) and after that is an easy time to check cervical mucus and position.

Record yourall of your findings on your fertility chart each day. For women with very regular cycles each month may look strikingly similar. For women with irregular cycles a wealth of information may be gathered from serial fertility charts. Some fortunate couples may find out that their main problem was simply one of timing. Others may be able to eliminate timing as the major cause of their infertility.

First Response just recently came out with an Easy Read Ovulation Test: http://www.firstresponse.com/products/easyReadOvulation.asp

You can use an ovulation calculator by tracking the last few periods you had and averaging out your typical cycle. Visit http://www.4woman.gov/Pregnancy/ovulation1.cfm. This will give you an estimate on what days you are ovulating and what days you are not.

However, if you are using this as a method of birth control, it is not 100% accurate. Depending on if your periods are very regular every month than this will work. If they are early or late every once in a while, it may throw off the calculations.