spotting 10 days before period??

About two weeks ago I started birth control pills (me and hubby decided to wait on TTC for the time being) well about 3/4 days ago we decided we’re back on TTC 🤦🏻‍♀️ now I’m spotting. We’ve had regular unprotected sex the entire time I started the pills and after. Is this implantation or side effects of stopping the pills?