I'm getting nervious about preterm labor. I'm not high-risk at all but now that I'm almost 31 weeks I am feeling like…

I'm getting nervious about preterm labor. I'm not high-risk at all but now that I'm almost 31 weeks I am feeling like every little pain is a sign of labor! I'm just being paranoid I'm sure but this is stressing me out! I don't know how contractions feel or how I'm supposed to know when I'm going into labor! (I'm not trying to go into labor nor do I want to this early but I feel like I need to know what to expect)