Hi I'm 37 years old, I've never been pregnant. I have endometriosis and have been off birth control pills for several years now. I had unprotected sex on the 23 of April and he ejaculated the beginning part of his semen in me. My last period was on the 15 of April and it lasted about four days. For several years my cycle has been short and very light. I would like to know if I could get pregnant?