I had these exact same cramps when I was 27 weeks.. Turns out I was having contractions all day, and by the time I had went into the hospital the contractions were less than a minute apart and I was on the verge of going into perterm labor. I was very lucky they were able to stop it, though I've been on bedrest since then. You should always call your doctor or hospital! No question is a stupid question.
I got those too around that time, could be braxton hicks contractions
If you find your having cramps very consistently like contractions would be or any bleedimg along with them then definitely contact your doc and let them know! Theyll be able to give you advice over the phone if you explain to them whats happening! Always follow your gut.. better to be safe then sorry!
Normal!! Your gonna feel lots of different aches and pains through out pregnancy! I beleive what your feeling is your uterus growing and streching! If the cramps are really low the it may be the baby putting pressure on your uterus as well!