Should i go to the E.R? Plz help me

Hi lady's it all started earlyer when i went to the R.R and notice a little string of blood i just kinda thoght nothing of it and just keept looking to c if there was more bit nothing..but then I've been having contractions sense a little before 11 p.m I though they were BH sense they were 3-5 apart but I finish eating and drank plenty of water and feel asleep and pain woke me up at 2:30 a.m now I have a lot of period cramps and some pain in back and baby pushing down like there is no tomorrow and still some BH... What should I do? Do I go is it normal? Plz help I'm desperate and its almost 4 a.m