Am I Pregnant?

This is sort of hard to explain but I’m stressing. Basically I’m on the combination pill, and two days into a new pack (2 days after my period ended) i took my second pill 5 hours late then had unprotected sex. The next day, I started bleeding for 2 days... could it be implantation bleeding meaning I’m pregnant ? Also it might help that I recently rearranged my pills (delayed my period by a week), so could that be it ? Please help!