Scared

This is my first pregnancy. The other ended in a chemical pregnancy in December. I am so afraid of going into that ultrasound on 7/6 and nothing being there. Deathly afraid. I also don't feel very pregnant, I am 4w6d and worried that something is wrong. I am on progesterone suppositories so if I was to have a loss, I wouldn't even know. I just keep crying afraid something is wrong.