Terrified of a miscarriage...

I just found out I’m pregnant yesterday, we told our really close family today because we’d want them to know either way. This is my first pregnancy. Clear blue says I’m only 1-2 weeks I’m scheduling a doctors appointment for Thursday and going from there. I’ve just been feeling such fear over losing this one. This wasn’t planned, we didn’t plan on having kids for a long time but I’m so glad it’s happened now and I can’t imagine it any other way. Does anyone else feel this way? How can I ease the worry? Am I being irrational?