I’m really stressing out right now

So one of my apps said my period was supposed to come today and the other days that it’s supposed to come in three days. Me and my bf always use protection and always make sure the condom is not broken ( he’s a 100%sure we were safe) but I get easily worried and stressed out about things like this!!! Today I put a pad just in case it came and discharge came out! Any ideas of what it could be? Should I be concerned? Am I pregnant? Or just over stressing?