Hi, me and my partner had protected sex 6 days ago and I'm also on birth control (depo), before he could ejaculate into the condom while it was inside of me, I made him stop but lately I have had stomach cramps like my menstrual cycle is coming but ever since my last depo shot, I've had an irregular cycle which lasted 2 months so at the moment I don't know if I am expecting a cycle or not. I wanted to ask was there a possibility that I could be pregnant and how can I tell if I don't have a regular cycle?