Im a young woman who has been on birth control for the last year & a half, recently missed one or two pills and had unprotected sex. My period (which has never been irregular, always on time and lasts for a few days ) came nearly 2 weeks early and didnt last as long and now Ive had very light spotting for the last few weeks and feel randomly nauseous and get odd cramps, also oddly my sense of smell has heightened .. Am i pregnant or is there something wrong?