Should i be panicking ??

I’m 34w and 5d and I’ve been passed pieces of my mucus plug (like everytime i go to the bathroom i have some , sometimes more than others ) my dr already knows about It but yesterday I was driving home I started having contractions about every 10-15 mins for bout 2 hours then It either stopped or eased up (I’ve had contractions different times and had no idea I was even having them ) but now I’m cramping like crazy like a super heavy flow and my backs killing me and I’ve been having lightning crotch and I’ve been nauseous and just gross feeling to my stomach so is this something I should be worried about or just it’s normal right now also I will add I was in the hospital at 32w and they told me I’d have my baby preterm more than likely and I have a dr appointment Thursday should I call and tell them or just wait till Thursday? Sorry for the long post and lack of punctuation lol I was just quickly typing