Is it finally happening? I need encouragement.

I have finally had a positive pregnancy test and AF is over a week late. I was diagnosed with endometriosys at age 16 and was told the chances of me conceiving and carrying to term were slim to none. I have miscarried once before. My partner is worried that I'm too excited for this, that I will be devastated if the worst were to happen. I can't help it though. I'm so excited. I feel complete.

Any advice? Any one experienced anything similar? I need words of encouragement right now.