I can say 99% that it's all good. You have already ovulated which is your fertile time. Before i got my tubes tied, my husband and i went unprotected the last 3 or 4 days before my period. If your cycle is spot on, and you know exactly when your getting your period the same time each time, i wouldn't worry about it.

But I wouldn't do it again if I were you!
I'd look into birth control so you don't need to worry as much.

You had your period. You are not pregnant. Taking chances causes lots of worry and stress. Get some bc so you can be rid of this type of anxiety. Hugs.