Is it normal to be obsessively worrying about miscarrying?

I am 4 weeks 3 days, and this pregnancy was planned however I didn’t think it would happen on our 2nd month of trying since I have endometriosis and just seem to always have female issues. With that being said, ever since finding out I can’t stop worrying that it won’t last long and I’ll just miscarry. My sister miscarried at 10 weeks and I’m just ready for the first trimester to be over. I don’t know how I’m going to handle it emotionally for the next 8 weeks 😩

I did google how many pregnancies end in miscarriages and it says 50%, that are chemicals when a woman may not have even missed her period yet. But 15-25% for the women who have missed period and found out they were pregnant. That gives me a little more hope, I still just can’t stop stressing about it. ☹️