I started the pill on the 27th of March and on the 31st, I had sex without a condom. My boyfriend said he pulled out on time but I'm really worried. He said he's 100% sure that there's no chance I can be pregnant. My period came back the next day and then stopped and i had discharge for a week after that and now on the 17th of April, I've started spotting and I'm really worried. What are the chances I'm pregnant?