Period Help!!!

So me and my SO had protected sex on Friday July 29th and he said that everything was okay with the condom after we were done. Today I woke up and there was a little bit of blood on my panty liner so I thought it was my period so I put a pad on. I went to the bathroom just now and I'm not bleeding anymore!! My period is suppose to come tomorrow and I've had all of the pms symptoms!! Am I just being paranoid or did I have implantion bleeding? Please help!!