My boyfriend and I had unprotected sex about 3-4 weeks ago. I wouldn't say that my periods are irregular or regular. They always come the last week of the month. Well it is the last week of the month and still no period. I've been having brown spotting. I NEVER have spotted between periods. My breasts hurt. I'm exhausted, foods that I once loved eating I don't even want to think about, I'm bloated and I've been experiencing a butterfly feeling in my stomach.hpt came out negative. Could I be pregnant??