My bf brought up the possibility today..

I didn't notice it, I've had a cold For the last few days and today we were driving down the road and I said do you smell that fire? It smells awfully good, he said i don't smell any fire babe, you sure your not pregnant? I'm on what I believe is my period so I obviously answered no but we did have unprotected sex (no withdrawal method) about a week or so before it started. I've noticed like today, I couldn't wait to get home, I started watching a movie and within 15 minutes I was asleep, and I didn't go to work today. Yesterday was a nap/lay around the house day so sleep wasn't an issue. Don't know what's up with me, we're TTC so maybe it's just wishful thinking but has anyone ever experienced somethin like this? Any ideas/suggestions?