18 Weeks and Ultrasound

Today I went for my ultrasound, something that I really wished someone other than the ultrasound tech was there with me for. I don't know if its reading too much into horrible things that can go wrong with the baby or the fact that I've been sick for almost 3 weeks or something else, but I'm scared that something could be wrong with this baby. I made it through ok not being able to look once in a while when she went down to the legs so that I didn't find out the sex. The heartbeat was 126 which is sooo low compared to S. Another reason why this might be a boy UGH! She did have a hard time trying to get good measurements of the baby's head b/c it was being stubborn. I think she finally got a good one that was at the right place for the right measurements. I dont know how I'm goign to make it this week without knowing if everything is ok or not but I pray and hope that everything is. I do need to call my midwife about this throat pain I've had b/c its just getting very uncomfortable.