Plan B

Hey ladies. So my boyfriend and I got a little carried away last time we had sex. I guess the end kinda snuck up on him and he started cumming while still inside me. He pulled out right away though and still came quite a bit more outside of me. I was in the fertile window and was nervous so the next day I took plan B. I then got my period two weeks earlier than usual. I was relieved because I thought this meant I wasn’t pregnant and everything was okay because side effects of plan b are an early period. However, my period only lasted for 2 days (when it usually lasts for 5) and was much lighter than usual. I’m wondering if that was just spotting and I could still be pregnant? Anyone have an input or advice?