Does it sound like I should take Plan B?

It is a day before my period is supposed to come. So my boyfriend and I had sex twice last night. The first time we used a condom and he ejaculated. We laid in bed until about 20 minutes later we started to have sex again only this time we were having issues with the condom so in the heat of the moment we took it off and continued having sex without a condom. He pulled out and ejaculated down my butt crack. My question is - should I take Plan B just to be safe?  I thought we should be ok since I am not ovulating and my period is a day away but now I'm having second thoughts. Also he did not urinate after he ejaculated the first time.  What are your thoughts?  I do not want kids.