Pregnant?

Rebecca
So I'm experiencing uncomfortable abdominal cramps today...like my AF should be here any minute but I'm not due for AF until February 27th. Today is cycle day 16. Yesterday was the last day of my fertile window and SO and I had sex 6 days during the window. Could this cramping be related to early pregnancy? I don't usually experience cramping mid cycle like this and my uterus just feels very full. This is our second month actively TTC but I've been off birth control since October. Can anyone tell me their story of how they felt this early in the pregnancy game?