Contractions with twins at almost 29 weeks

Corina
I am pregnant with mono/di identical twin boys! Everything has been super good so far with my pregnancy and the babies no problems until two days ago start feeling the sensation that my period was coming like something was dropping went to hospital and found out I was having contractions gave me fluids, did a couple test to see if I was in pre labor and came negative gave me a shot on my arm like a vaccine type to stop contractions and it did 
Scariest night ever! Today trying to relax going to call my obgyn tomorrow to schedule my visit sooner this week! 
Praying to god every bring will be ok we still have 6 to 8 weeks to go