HELP PREGNANT?

Chloe
Okay so I had sex last night, no condom. 
I'm usually on birth control, I missed my appointment so I'm a few days late getting it. 
He didn't cum inside me but he MIGHT have near my vagina so yeah. I'm also on my period while we had sex, but my periods are extremely irregular, like this month it was 2 weeks, nothing for 1 week, and it was back this week and ended today. 
Could I be pregnant? If so how likely? And should I get the plan B pill or would it be a waste of money. 
I'm honestly so scared, please help. 

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