Not sure if I'm pregnant

Annabel • "For this child I have prayed..." 🛐✝
So I took a test in November and it was positive. I'm supposedly 12 weeks. I had a miscarriage earlier this year at 8 weeks so my uterus has been at least that big before. I'm not showing. In fact I'm withering away. I have the flattest stomach I've ever had. Ever. I'm already naturally skinny and I throw up basically everything I eat. Should I have my doctor check for a heartbeat again? I heard it at 10 weeks but I'm so nervous. I had a dream my baby belly was just a balloon, then the next day I dreamed I went to the doctor and there was a heartbeat and we even got to see the baby on the monitor. I'm trying to trust God with this. I feel like he wouldn't bring me this far to just let me down again. Husband said everything is fine and I'm just over worrying myself. What do you all think? I don't have the dread in my stomach like I didn last time like something is wrong. It's more like constant questioning of "should my belly be bigger yet" you can see a bigger stomach sometimes after I eat lol and I've heard of stories where some woman don't even know they're pregnant because they have no signs, and the way the baby is positioned, you don't get a stomach, which I feel is nearly impossible with how little I already am, but the doctor said my uterus is til it's back. Is that maybe one reason why I'm not showing yet? I'm lost. And worried. Help me out! Lol. ❤️