Pregnant?

I had my period on October 18th but it was really different than normal it wasnt blood it was brown, dark thick stuff and it only lasted like 2days i usually bleed for 4 days and its normal bright coloured blood.i always forget my pill sometimes and i forgot to start taking my pill again after my period as i left it at my mates house and havent got it back yet. Even tho i have more packets i just never took any, anyway now i think i might be pregnant because i forgot some pills last month and on sat and sun me and my boyfriend had unprotected sex and even tho we have before and i have never got pregnant i think i might be this time but he just tells me not to worry, that i wont be. But i have been getting really sore pains in my stomach through the day and i keep getting cramp. I dont no if these are maybe signs of me coming off the pill as i havent took it in 2 weeks or that im pregnant. Could Anyone Help Please X