[Harmony♥]

Like the others said, you've been very safe with using both birth control and condoms. Of course, there is always a chance of pregnancy when you're in a sexual relationship, but with the care you've been taking, I highly doubt it's likely that you're pregnant. Periods can become irregular due to many things such as stress, changes in diet, new exercise regime, etc. It could be any of those things, including pregnancy. The only way to know for sure would be to take a pregnancy test to make sure.