Preterm Labor Paranoia

I never had the Braxton Hicks contractions with my forst pregnancy so I dont know what that feels like. I am 27 weeks and the last couple of weeks I have been having consistent dull lower back pain and pelvic pressure, and I have cramps (nothing unbearable, its mild but I do feel it). I know baby girl is head down, she has been for a while. I am just in constant discomfort/pain and I am probably psyching myself out. I want to see how I feel during the weekend and if I don't feel better I'll go see my midwife on Monday. Anyone else feel this way? My first pregnancy was so smooth and easy so this feelings are new.