Im 37+3, was contracting Friday in labor and delivery, they gave me i.v to stop contractions but i didnt feel them because i've been in constant pain..well now im having what i think is back labor, it feels like a knife stabbing in my back for about 20-40 seconds and 3 minutes apart..my stomach is tight so im not sure if its tightening or not and i dont feel any contractions still in my stomach just the same non.stop pain?? Advice please??