Hi @Blii ....looks like we're in the exact same boat! I got my BFP on Sunday too after a year of trying, including one MC and one chemical.
It's such a stressful but exciting time and feel exactly the same, I can't help but worry and freak out at the smallest thing, I too have very little symptoms, I actually only took a pregnancy test on Sunday as my period was due the following day and as I'd had a very strong positive OPK which I thought was weird, but I have had no symptoms really at all.
I reached out yesterday to my EPU for a reassurance scan at 8 weeks because of my previous history of MC which unfortunately isn't until start of Jan, and I've got an appointment today with my gp to discuss and hopefully get some bloods taken as I'm keen to know if anything is low such as progesterone etc. I'm also going to ask about taking baby aspirin as I've heard this can be good for women who have had previous mc?
My best advice would be to reach out for help and don't be scared to ask questions, or request scans or tests, if it puts your mind more at rest in the next few weeks you could book yourself in for a private early scan if the GP or EPU aren't keen to (I know too a lot of people can't afford to like myself) and in the meantime I would speak to your GP or EPU and make sure they have done necessary tests which might give you a little more reassurance, it's good to speak to someone and let them know your concerns!
I know it's easier said than done not to worry, as I'm trying to tell myself that every moment of today...but what will be will be. I hope you start to feel a little more confident, our bodies are so amazing and a pregnancy is an absolute miracle, try to keep calm and tell yourself each day "everything will be fine" because it will be! I hope you have a healthy and happy 9 months, keep us updated x