Does Brown Vaginal Spotting And Tingling In Lower Stomach Indicate Pregnancy?

hi i was just wondering if you could help me. I am on the cerazette pill i have been on it for the past 1yr 3mnths. I missed it on week 4 of my pack and had intercourse the day after. The following day i had dark brown spotting that lasted 2-3 hours. I then forgot the pill again the following wednesday ( week 1 of pack ) and had sex the saturday sunday and monday. since then i have had sore breasts and stomach cramps i have also had a tingling feeling in my lower stomach throughout the day. am i pregnant