What to do?!

Alanna
So all day I've been cramping really bad. At one time I went to the bathroom and when I wiped it looked like a bit of my mucous plug had dislodged. My back has been hurting like hell since last night. But I also noticed baby not been moving like he normally does. I've barely felt him move all day. And when i walk my i feel so much pressure down there. Like i cant stand up too long. I have been kinda stressed the past few days, idk if ive been doing too much or what. Idk im just worried but should I go to the hospital? Or any advice to stop the pain?? Should I really be concerned?? I'm 27 weeks, almost 28.