Whelppp! Plan b

Well this Saturday my bf were horn dogs and I let him finish on Saturday🤦🏻‍♀️ which says I was suppose to start my period. Took the plan b on Sunday less then 24 hrs.

That night I did take an ovulation test and negative.

But now I’m 3 or 4 days late I did take a pregnancy test yesterday came back negative. So I’m confused after help a girl out.