Begining of Last period was July 29th they last around 5-6 days. It's now sept 13 & nothing. I'm not regular but not irregular if that makes sense. 30-35 days at most. I had unprotected sex aug 20 (he cummed and went back in) I'm experiencing lower back pain every now & then , sharp little pokes below my bellybutton , nipples look a bit brown, & my boobs are sore! I took a hpt last weekend and it was negative maybe my levels weren't high enough. Hmm what do you think !