TTC nerves

My partner and I both really want children and can’t wait to start a family, so we have talked A LOT about TTC. We always said it wasn’t the right time yet etc and yesterday we sat down and decided it is. Obviously there is never going to be a “perfect” time because you could always have “a bit more money” or “one more holiday together” etc, so we decided we are both ready now. All I’ve ever wanted was to be a Mum and I’m so excited, but now that it’s actually time to start trying I am TERRIFIED and it’s making me start to doubt myself. Is this normal?