Girls, week 27 is here. Yesterday and today I have some stomach pain, …

Girls, week 27 is here. Yesterday and today I have some stomach pain, like before my period. Is this normal or not? This is my first pregnancy, so I don't know what sensations are normal and what aren't. I read online that in principle, if there are no heavy bleeding and the pain isn't constant, then you just need to rest and endure this pain.