I am 24 and I have been on birth control pills for about 3 - 4 years. I have pretty regular periods and I am about 4 days late. Just today I noticed a clear jelly like discharge when I wiped. I don't know what that is, it doesn't smell. I am having a little lower back pain just as I would if I were bleeding. I took an at home pregnancy test and it came back not pregnant. I really don't think that I am pregnant because I always take my pill and my boyfriend and I have never not used a second method of birth control while having sex. We are both each other's first partner s so I am ruling out any STD's also. What should I do? Is this normal?