28 weeks pregnant

Chrystal
Hi, I'm 28 weeks pregnant. I went to the emergency room last night due to contraction and pain in my left side. I completely lost my mucus plug. The doctor checked my cervix and said I was 1 cm dilated and my cervix was thinned out. They also checked baby girls position and said she's head down. I feel a lot of pressure like she's bearing down on my pelvic bone. My question is, should I be worried about her coming early? This is my 3rd child and I am currently on bed rest per doctors orders.