Braxton hicks @ 2nd trim

How often do you get braxton hicks @ 2nd trim ? Im currently 25weeks and started to notice that i get stomach tightening and stomach very hard quite a number of times thruout the day Is it normal to get it often in a day ? It doesnt hurt at all though and only lasted like 2 secs ? Then soft again. (Idk if its actually braxton hicks or baby’s position) But baby still moving well afterwards. Im scared getting it often means contraction will be coming soon or preterm labour 😣 #firstbaby