TW scared of miscarriages?

Even after having healthy babies? I had two miscarriages before I had two healthy babies. I’m now pregnant with my 3rd hopefully healthy baby. I’m only 4 weeks and I find my self getting excited then immediately scared thinking why get excited what if I miscarry? Does this happen to anyone else? I bought a few things already out of excitement but now I’m scared and thinking maybe that was a bad idea.