30wks preg. having bad abd/back cramps & pressure. ob cked/felt,was having contractions.no dilation. observed for a bit & released. what are these?

Prodromal labor: Sounds like preterm prodromal labor contractions (prodromal = false). The uterus actually starts with contracting around 15 weeks as mild cramps. For a couple days after sex, when your bladder is full and with activity you may have some painful nonfunctional contractions. It could also be uterine irritability (short 10-30 second rapid contractions) caused by the same thing and nonfunctional