Getting back into gummies (Delta 8/9)

I was using 25mg Delta 8 gummies for the better part of last year, but I had to stop because (I think) the antibiotics I was taking messed up my stomach chemistry for a few months. I couldn't have one without getting nausea/stomach pains while feeling like the world was too bright and noisy.

I think I'm back to normal now, so I went and grabbed some 15mg Delta 9 gummies. Any advice for a novice/lightweight? Did I fuck up and grab something too strong?