I have been on birth control for over 2 years, and i have always had a regular somewhat heavy 6-7 day period. i have recently switched to a new birth control about 4-5 months ago. about 2 weeks ago a had sex for the first time in almost a year. it was also unprotected. about a week after that i started my period a week earlier then usual. it was also extremely different then normal. it was very light, almost spotting and i still am on it. its been about 13 days and its still extremely light. very on and off. and i have no cramps or usual period symptoms. is it possible that i am pregnant? im scared that and am thinking about taking a home pregnancy test.