4 weeks 4 days pregnant and need some advice please!

Im 4wks 4 days... The OB didn't want to see me until 7 weeks and I had to call back and get something sooner bc I'm too anxious. I don't have any spotting or anything questionable going on, but I'm really worried about progesterone and other hormone levels- and just miscarriage. I feel like certain things can be prevented if you know what's going on early enough, right? I got an apt. For Monday and I'll be exactly 5 days at that point... Am I just freaking out unnecessarily?