How often?tummy tightneng

31weeks pregnant- Hi im FTM i notice that since i enter my 29 weeks of pregnancy i having tight tummy unti now 31 weeks but i notice that my tummy tightneng constantly in a whole day?Is this is normal or any mummies encounter like this?i dont have any vaginal discahrged but i really worried of having a constantly tight or contraction.#firstbaby #firsttimemom anyone can experience this coz my tummy tightening like 10 to 12 times in a day