birth Control question

Torng
Hi guys! So I have a few questions. Umm.. I've been on bc (birth control) for 13 days no and I've had protected sex until 2 days ago I have u protected sex but he withdrawal. Am I still safe??
Also, after taking these bc, my stomach and uterus looks swollen and like bigger. It looks like I'm actually pregnant. Am I ok??? 
I'm really nervous if it is the bc that is causing it or the unprotected sex. 
I use ortho-cyclen 28 combined.
Please help!!