I don't know where to start but here goes,I have a under the skin cyst (as the Dr. Calls it) on the left side of my stomach,its been there for about 1year causing me no problems... I had unprotected sex on Jan 20th, came on my first cycle Jan 10-14th, second cycle Jan 31-Feb 7, now my third cycle started yesterday Feb 14th... why is this happening? They all came as regular cycles,NO SPOTTING,regular cramps,regular study flow of blood... I am 5'6, 114lbs, 24 yrs old,if that helps at all. I go to the Dr. Tomorrow,does anyone have a clue of what's wrong with me... I thought my cycle was just switching the first time until the 3rd cycle came yesterday 6days after the 2nd one. I'm scared like crazy... any advice at all will help

Oh and I'm not on and has not been on any type birth control, I'm not stressed,but I am anemic a little.