Also, take a test if you're unsure when you've missed your cycle. Good luck.
There is always a possibility you can become pregnant during unprotected sex. If your period cycles are irregular, I suggest you not continue to allow him to do that, unless of course you want to become pregnant :-) I was very irregular, my cycles were anywhere from 25-33 days, the first time we stopped tracking my cycle and agreed we wanted to start a family, I got pregnant :-) so be careful if you don't want to get pregnant but enjoy and don't s stress if you do! :-)