tearing feeling inside vagina

35 + 4 I'm having preterm labor contractions [not bh] which they said should eventually subside because I wasn't dilating just effacing and the baby was -2 but tonight my contractions are pretty bad (still not consistent though) compared to the ones before and I feel like a tearing up inside, not exactly sure where 😕 Is that normal? Or what could be causing that?
No infections, sti's or uti's (was tested last week) 
My dilation was checked and closed 50% effaced and -2 as of 2.5 weeks ago.