Question ?????

So my period has always been normal I would bleed for  heavy red for 3 days the 4th and 5th day it would be medium flow but still red and the 6th day I may spot (brown color ) may not and the 7th day I would spot (brown color ) then no more period . Last month my period was fine my husband and I had sex thought out my fertile days but only once on my high fertile days this mouth my period is all crazy I bleed heavy the first day the second day medium 3rd spoted and haven't had anything since . I'm feeling concern bc for my entire life this has never happened to me . Should I see if I'm pregnant can I be pregnant ? I also did stop my birth control on October 5th I had the birth control in for a year and a few months . Any suggestions ?