Nervous...

I had my first baby on January 25th. I've been exclusively breast feeding and my period has not returned yet. My husband and I have been using a condom when we have sex since I have given birth but tonight we didn't and now I'm freaking out. I'm just getting into a routine with my new baby and I'm loving our 1-1 time. I'm not ready to have another one yet. Anyone have any experience with this?