I was really excited on Friday when I got my bfp, but now I'm just stressed. I'm trying so hard to be positive but I'm just so so scared

Since about Saturday, my upper back, neck and shoulders have been sore....like I pulled a muscle or 2. It's not BAD, but it still aches. And I know shoulder pain can be a sign of ectopic pregnancy, so I am absolutely FREAKING!

My DH says that your upper back/neck/shoulders is where all the stress collects, and he thinks I'm stressing myself out so much worrying about m/c that it's causing me pain. Could that be true?
I called today to make my 1st appt, and it's not until March 5th...a whole month away!! But I asked the receptionist to have someone call me back so I can ask them about the pain, and my voice started shaking on the phone, so I'm hoping she realized how worried I was and someone will call me soon.
Reassurance please?
***UPDATE***
So the Dr called back, many hours later, and told me not to worry at all b/c my neck/back/shoulders hurting is NOT a sign of ectopic. She totally understood that I would be stressed b/c of the loss, and she also made an appt for an early u/s for me, right at 6 weeks, on V-day

I'm hoping it goes well. I'm feeling much much better now tho, and thanks for your reassurance!