idk what to do. any advice?

(Tw: miscarriage)

I am so so lost. I'm 5 weeks pregnant and I am losing weight, again. I know that in my first trimester, I am at MOST risk for miscarriage. I'm terrified of miscarrying again. The last time when I was pregnant, I miscarried, and the doctors found out that it was because I was losing weight, instead of gaining. This time around, I'm losing weight AGAIN. I'm eating normally, I'm even adding more protein into my diet, since I normally don't eat a lot of protein. I also take my vitamins and drink plenty of water. I don't understand why I'm losing. I don't want to lose my baby again. I don't know what I'll do if I lose it.

Does ANYBODY have any tips for me to gain weight? I'll try them, even if they're silly or seem stupid.