weird periods

so in November I started to dating my bf and in October I thought I was pregnant by him or my kids dad well turns out when I got a check up I wasnt pregnant I had actually my birth control felled out of me and after my periods been weird like in February I didn't have a period for 2 months so me and my bf took 2 pregnant test and it said no so since then i would missed one month then the next have a period for a day or 2 and spot for maybe a week and now I'm just wanting to know is this something I should worry about or is it normal?