Ok I am 23 years old. I have been with my fiance about a year and 1/2 now. About 6 months into our relationship I bled during sex for the first time..

it was so humiliating, it is not painful whatsoever....So much that unless I check I wouldnt even know I had.....I saw a doctor and everything came up fine. Now it has been a long time and about every 6 weeks it will happen and I just dont understand what it could be. I know it isnt certain positions or being too rough,deeper thrusts,etc.. Because we have similar sex all the time but this only happens once in a while. It just has become a real hassle and nervewracking for me. If anyone has any idea what this could be please reply! Thanks