Nervous!!! Help plz 😟

Me and my husband have been trying for a baby for over 2 years. We have several tests and i was diagnosed with pcos. But Then few months ago I got my very first positive line! I have been hoping and praying ever since. Due to my sickness I was hospitalised and they did early scan at about 8wks. I was just waiting for something to go wrong and it didn't. Baby was there small but there with hb. I have my 12week scan tomorrow and am crazy nervous. Like almost irrational. I'm worried something will go or be wrong with the baby. I think sometimes i feel its too good to be true or maybe i dont deserve it. I know there is probably nothing I can do bit I thought sharing and seeing if anyone had similar anxiety might help me.😣 any words of wisdom? X