First baby am I in early labor

I’m 36 weeks according to my dr they say I am measuring up with my last period which wasn’t my last period my actual last period was in July so I think I’m 38 weeks. He’s been head down since like 32 weeks according to the drs measurements but I was very small before I got pregnant. I have been having contractions and not always able to feel them but my pelvic area and vaginal area have been having severe pain and I’m so tired. I have not had my bloody show or my water breaking and my next appointment is the 23rd and I’m not sure if I’m in early labor now or not anyone got any advice on what I should do and or if they have experienced the same thing. Also at like 22 weeks they had to give me a shot of breathin sorry if I spell incorrectly. Not to mention I have been drinking enough water and I still am having contractions that I don’t feel like pain wise but occasionally I do and it gets to the point I can’t walk or move