Period like cramps all day!!

Pris
Hello lasies! Im 30 weeks today have any of u experienced period like cramps since like 27 weeks ? Mines are throughout the whole day even at night :/ my first pregnancy i didnt have them i gave birth at 36 weeks im hoping its not preterm labor :/   im wondering if its normal anyone else on the same boat? Or any ideas? I know i can call doctor but i told her already last week at my app and she didnt really say much ;/ thank u ladies !