Finishing inside and birth control

So I’m on Lo Loestrin Fe and my boyfriend (who is in the Navy so neither of us have gotten laid in MONTHS and by the next time he comes home it’ll be over a year) and me are going to have sex the next time we see each other. If he “finishes” inside of me what are my chances of getting pregnant. And do I ovulate while I’m on this kind of birth control? Should I even be worried about it?