Does it sound like I could have been roofied?

Sunday night me and my two best friends went of these two guys house. They both know them pretty well, so I felt safe. It was just the five of us and we were all drinking. Me and one of the guys were flirting all night, and he even told my friend that he was into me. Well I was drinking vodka mixed with orange juice, I think I had about four cups of it total. After the 3rd cup, I was starting to feel drunk, but not to bad. The five us were playing card games, and I finished my drink. I started to get up, but he told me to sit back down and he would get it for me. Normally, I'd get it myself but he seemed like somebody I could trust. After drinking that last cup, about fifteen minutes later I started getting even more dizzy and tired. I remember putting my head down on the card table and I heard the guy say "is she asleep". I shook my head, and put my head back up because I didn't want to seem like a buzz kill. After I remember the other guy put on Harry Potter and I only remember watching only about maybe 5 minutes of it, after that, everything else is very unclear. However, after about four hours (I checked my phone text messages the next morning, and I assumed it was around 3 am when I woke up), it seemed like I woke up. I felt like I woke up from a dream, but that I was still detatched from my body. I remember us hooking up when I woke up, but I don't know how it started. I don't know if I agreed to it, or if I initiated it, or how it even started. It was like I couldn't even say yes or no even if I wanted to. I remember him telling me that my pants needed to come off, and then I remember feeling a lot of pain (I was still a virgin). Then I only remember about 10 minutes after that, then I woke up in the morning next to him. The next morning was very awkward, and he left to go to work. Later that day he texted my friend out of nowhere and told her that we didn't have sex because he couldn't fit (which makes me think that we didn't, even though I remember feeling a lot of pain). The next morning I also had a terrible hang over. I also woke up pretty sore. The thing is, I've drank a lot more than that before and I've been fine, and I've never blacked out like that before. I just don't know if I was slipped something in my drink or if I was just a drunken idiot. I also don't know if I'm still a virgin anymore, which scares me. Bottom line: I don't know if this whole thing is my fault.