Fertility specialist 😰

Sarah-Jane • TTC 16 months💏We did it🤰🏽Sophie born 10/7/18💕
After 7 months of trying (I'm onto month 8 off birth control)  I've been referred to a fertility specialist. I have had 2 cycles of 21 day bloods taken to show I am still ovulating. I have a 10 year old daughter (from my previous long term relationship, we conceived in a month)
We are having a semen analysis done on that day also as my fiancé doesn't have any kids. I have a regular 27 day each cycle each month but that doesn't stop me worrying about what's goin on inside me!
Question is, if any women have been before what do they ask, what happens if analysis for my man comes back ok what's my next step? (Haven't had an hsg yet) I'm just trying to get an idea what to bring/say as I'm so nervous 😫 thanks