My last period ended July 9 & I had unprotected sex July 11. He ejaculated inside me so I took a plan b that same night. A week later I started spotting but that only lasted for 2-3 days. My next period was supposed to come on the 31st so that makes me 7 days late. I recently started spotting but this time it’s a pink color & I’ve been super nauseous to the point of vomiting. I took a HPT and it was negative. Could I be pregnant or are these still symptoms from the plan b?