Most likely a scratch or the stress of having some finger in and out could also have made your uterus bleed (like it does when you are on your period) just a bit. I don't think you should need to go to the doctors just yet. Just keep an eye on it. Make sure he trims his nails and isn't rough. If you don't want to do it again you don't have to. It's your body. Make sure you are comfortable with what goes in it!
Eh I'd say go to the doctors.Why am I having thick brown discharge?
im having the same problem now..
but, how long did this "bleedin" last?