My bf and I had sex on the 12 the day before my period was suppose to start. The next day it started but it was only 4 days and was mostly brown and a faded red color. Fast forward to the 23. I started having weird cramping all in my lower abdomen and uterine area. The only way I can describe it was like a sharp and sometime dull stabbing feeling and then other times it was just cramping like a period. I've never experienced this after a period so I'm curious as to if I am possibly pregnant or if its something else like maybe a cyst. What are your thoughts? O.o