My boyfriend and I were dry humping last February 7th. We were both wearing underwear. I was wearing cyclings and panties. I've had vaginal masturbation since I was aroused and he only had pre cm. He didn't ejaculated. I've been worried since then that I may get pregnant. I got brown discharge on February 15th. And got my period on the 16th day. It last until February 21st. But it was scanty. I have been taking vitamin c and butiao tablets since I was so worried that I might got pregnant. I also think the possibility that my period is implantation bleeding and not menstruation since it was so light. But I searched it online and it says that implantation bleeding only lasts for 3 days. I had my period for 5 days. Is there a possibility of pregnancy? Hoping to get a response asap. I am too stressed and worried since that day happened. Please enlighten me