BH or Contractions? Ftm

I’m 36w3d and started having on & off cramps around 7:30 they would be 4 minutes apart, I moved positions and chugged some water then they became 2 minutes apart, they feel like period cramps and horrible back cramps, I also feel stinging in my vag. I also tried taking a shower to see if they would calm down. Should I call L&D first or just go? I don’t feel tightness in my belly and baby is still moving and being active. Thanks in advance!