I had sex with my partner on the 12th day of her periods. She has a 28 days cycle. I had some of my pre-cum (semen) left inside her vagina. But mid-sex a minute after starting I used a condom and ejaculated inside it. It was a safe sex. But read somewhere that pre-cum can cause pregnancy too. So I gave her a contraceptive pill (unwanted 72) 24 hours later. A week later she has been getting feelings for vomiting. Most probably due to acidity. But is there any chances of pregnancy. If there are chances of pregnancy does vomiting starts so early? Please HELP. THANK YOU.