My boyfriend and I were both kissing and all. He took all of his clothes off (became completely nude), and I only had my very thin thong on, everything else was off. He then started rubbing his penis on my vagina for like an hour straight. I felt wetness, he didn't cum but I know he had precum. Is there any way I could be pregnant from this? My thong was extremely thin, so should I hurry and take plan B?!