Could I be???

Ok, so I'm approximately 12 days late today I'm on a 33 average cycle and I've never been this late. I had my last period Sept 5 due October 8 and it's now October 19. Yes I had unprotected sex with my partner but we used pull out method on the first day I ovulated last month. I'm late I have slight cramps, back cramps at night and nipples are just a tad sensitive. Also a weird pain on left side. Mind you I've done 2 tests last week both negative! Yesterday at night I did another and I swear I saw a faint second line. Could I possibly be pregnant? I feel like my period could come any day but then it doesn't. I'm dryer than dry down there! Please help!