What are the chances I’m pregnant

Yesterday a guy and I hooked up and he rubbed his penis on my vagina before he finished ( the head wasn’t near the opening). Im ovulating and I’m freaking out because I’ve never had a guy not wear a condom before. I know we didn’t have sex but all it takes is one sperm so I’m freaking out and my period is not for a while so I need some peace of mind if it’s very unlikely. Thank you