I think I'm having contractions

Grace • Zion James 1/22/17, Kingston👼🏽 10/14/18, rainbow baby due December 19’🌈💕
So about 40 minutes ago I started getting a really strong cramping feeling from my pelvis to above my belly button but I kind of just ignored it because I've been having a lot of menstrual like cramps lately. Well as I was doing my laundry and putting my clothes away I had to stop a few times because the pain was real intense...kinda feels like someone is pulling my insides and it hurt around to my low back too. It's stopped now for about 3 minutes since I have sat down. Should I try to time it if it starts again? What does a real contraction feel like?? Sorry I'm a FTM and I'm scared I'm not gonna know when to start timing or if what I'm feeling is contractions or just pains and aches. Oh and I'm 38+3