Not calling doctor yet, but...

Baby has not been active today at all. He has specific times where he is and wasn't. I took his heart rate with Doppler and it was 135. It's normally 150. I know they fluctuate, but my baby's stays within 5bpm. I took it again a few hours later and it was 135, 170, 140, 135. I am so scared the cord is around his neck. Not to mention, I have a consistent cramp (unless he is just stuck in one position that is hurting me) that won't go away. :( My anxiety is through the roof! I know my doctor will just say movement doesn't have to be consistent and heart rates fluctuate, but I also know my son... Just venting! Trying sugar now. We will see if that helps!