Could i be pregnant

a couple weeks ago when i had my sugar pill week my boyfriend and i had sex and the condom slipped off at some point, but we assuming it slipped off when he pulled out. all the cum fell out of the condom onto the floor but we weren’t sure what exactly happened. i took a morning after pill a couple hours later and i had been taking my birth control regularly that month.

lately my period has been starting a week earlier and lasting longer. i’m supposed to get it next week but i noticed today i had very light spotting. im probably just paranoid but im also smelling this weird smell in my house that is making me a little nauseous/sick. is it implantation bleeding? or is it just my period and my paranoia. i think im safe because i took plan b, am on birthcontrol and we used a condom. but a part of me can’t help but worry