Please help

I've been under a lot of stress this month and I took plan b about 2 months ago. I'm supposed to get my period today or I was yesterday, somewhere around now. I only had sex 1 time but with a condom and he didn't even finish. We've had anal sex multiple times, but that's all. He might have touched me on the outside of my vagina , maybe, I'm not sure but not more than that; should I be worried?