Why can't they see anything at 6 weeks pregnant?

Is it possible to be 6 weeks pregnant and not know it?

Ok so im 15 and 6 weeks pregnant it be confirmed by a doctor and everythings been ok ; I get cramps relly baad And I always ...

I might be 6 weeks pregnant. I have taken multiple at home tests. They are all comming back negitive. My period is late, but ...

My belly is swelt at 4 and a haif weeks why is that when I was pregnant with my little boy a didnt start showing until after ...

so im 21 weeks pregnant. my mom says im 5 months pregnant and my friend tells me im 6 months. im kinda confused about which o...

I have had a little browse around on line but can not find anything thats helping me out. My husband is telling me not to wor...

ok so im almost 5 weeks pregnant, and im having a slight back pain in my lower left side, and im having a bit of cramping in ...

Ok, so I am a week late. About a week and a half ago I went to the bathroom and realized I was bleeding but not heavy like us...

Is it possible to get pregnant a week or two before your expected period?

I think I may be pregnant but I still have another week of using the nuva ring.should I wait the two weeks out or will the bi...