Preg or paranoid

Sooo my peroids have been kind if regual on the 27th. Then last month had protected sex and the next day started my peroid the 22nd since i got this app i have been constantly going by it logging and everything it said my peroid was supose to be here on the 22nd but its not...my boobs hurt like they normally do when i get close but am i just being paranoid or do u think i am??