34 weeks and I have been having sharp cramps that come and go. My belly feels super tight and sorry if this is tmi but I feel like I have to poop and have tried with no success. I hate not knowing what contractions are going to feel like. Is it possible that that's what this is? I also have this weird pulsing sensation in my lady parts I hate calling the doc everytime I feel something weird but I'm kind of concerned what do y'all think?