Back pain!

I woke this morning and screeched and it felt like i was being stabbed on my lowwer right side went back to sleep and when i woke up later my lower back is hurting so bad! Its coming and going and when my baby moves it hurts! Im 28 weeks 5 days i went into preterm labor last Thursdays dilated (only one) they gave me a shot to slow down the contractions and 2 more to speed up the development process of my babys lung.. it just hurts! I can take the pain but idk if i should be worried and go back to the hospital or not!?!?!