I went off the pill in January and hadn't sex I had my period in February and I haven't gotten it yet for March I spent the weekend with my boyfriend and we had sex more then four times and he finished in me numerous times 

I went to get plan b but there's weight restrictions which I don't fall into 

I'm not sure what to do 

Any advice ? 

Should I take the plan b anyway? Or wait to see if I get my period would my birth control still be somewhat effective because I've only been off it a month?