So scared of preterm labor

I am constantly worried I’m going to go into preterm labor

I’ve been feeling what feels like stretching all over my stomach, as well as on and off low back pain for several days.

I’ve been drinking lots of water and it’s nothing too painful, just uncomfortable.

Tomorrow is my drive by baby shower and I live in Southern California and our air quality isn’t great bevause of the fires. I’m going to be wearing a mask and taking breaks as needed inside the house but god, how can I be sure these feelings I’m having are not signs of preterm labor?

I’m 31 weeks and 4 days