Starting last night actually, around this same time, I started feeling this very odd sensation under my left butt cheek. It was something I had never experienced before. It isn't really paintful, but more so annoying and very uncomfortable. I couldn't sleep well last night because of it. (Also, am I allowed to take tylenol at 4 weeks?) but any way, tonight I'm at work (3rd shift bleh) and I have this weird cramping uncomfortable feeling in the same exact spot. Is this related to the pregnancy (is that even possible at 4 weeks??) or could it be something else?I will be speaking with my Dr. first thing Monday, but that's two days away and I'm concerned now.