Do U think I could be prego?

My boyfriend rubbed his dick around my vagina and humped me. He did not go inside me.. I’m a virgin. He also did not cum, I jerked him off after he did it. I’m worried that pre cum might have gotten in me. I was wearing underwear for the most part but it’s small and skimpy. Should I be worried? My period should come any time now but it Has not and I’m really worried!! Also I’ve been feeling crampy for the past few days and idk why! I’ve read that pre cum can get onto ur vagina and make its way into u!! What if that happened?? Is it true