Question?

Brandy

I was wondering what this could mean. My husband and I have been having unprotected sex for like 2 weeks but skipping every other day and sometimes every 3 days. My fertile window started the 19th. I had sex on the 18th after I started taking a birth control pill. I know that the pills domt work right away. Now I'm experiencing cramping, nausea and back pain. Does anybody know what this could mean?