I have a soft bump on the bottom of my vagina opening. It is painless and I would have never known it was there if I wasn't feeling around. It has the texture and feeling of a blister (like the one you would get after a burn, very squishy) but without all the pain. It is normally colored. I've also been experiencing cramps and pelvis pain as well as a missed period (I would be 10 weeks and I've had 3 negative tests so I don't think I'm pregnant). What could it be?