I do this all the time - have sex with my partner with a condom, get horrifically nervous before my period, get my period and then I'm very relieved. This is my cycle. This month however, my period was 2 days earlier, lighter than my usual very heavy flow and now I'm experiencing ovulation symptoms and cramps. I always freak out around, "I Didn't Know I Was Pregnant" and realize this is something I need to manage... My mind!