Just give it some time and try to relax. You have to learn to relax, even when you have reason to stress. find something to do, read, watch movies, hang out, hobby. consider doing some physical exercises, run, walk, cycle, gym, dancing or yoga.
You used a condom and were on the pill, so pregnancy is out of the question. It can take a while for your period to come back after stopping the pill. If you got on the pill to regulate your cycles, there is also a chance that they will still be irregular.