worrying

I'm on birth control an my boob seem to have gotten big which I know is a side effect of birth control but I'm worried it could be a sign that it may have failed an I am actually pregnant but I don't know if I'm just worrying over nothing or if I should actually be worried. I have no other symptoms of being pregnant and on the ring so it's not like i missed a day of taking it  🙈 what should I do ?