Plan B or Wait?? Please Help

Okay. So I took plan b like 2 weeks ago. Friday night we had sex again and after he came we got it all off but then a few minutes later went again. I know I'm stupid and we've got to be more careful but I need to know if I should take another plan b or just wait and see what happens from the first one. Please I don't need any "be more responsible" post. I'm an adult. Just wasn't very careful. Getting on BC ASAP.  
I had another very light period from the plan b and am supposedly ovulating right now. Highest day is this Tuesday so I was ovulating Friday night but not a lot