Positively scared out of my mind

This week last year my first baby stopped growing resulting in a mc. I have done 4 rounds of letrozole and this cycle was my first round of clomid. I tested every single morning starting at 8dpo. Every single morning it was a stark white negative. 13dpo rolled around, I almost didn’t test. Faintest of positives. I got my hcg drawn at 3pm on 13dpo and my result was 16.59. I am terrified of another miscarriage. 16 seems low. My doctor reassured me that it doesn’t matter where we start, since we don’t know when implantation occurred, we just want to see it double. I go tomorrow for my second hcg. It is so hard waiting and trying to keep the negative what if’s out of my head. I feel like a pro at giving advise to others with all the research of done and how much I’ve learned through my fertility doctor. It is so easy for me to use that knowledge to build someone up. Somehow when it comes to myself I forget everything I know. I know line progression doesn’t matter, but that’s all I’m watching. I know hcg ranges are different per person but that’s all I’m thinking about. I know that by definition of the word I am pregnant with a positive test, but all I feel is that I am positively scared out of my mind. I want this so bad.