Had my appointment yesterday: GP, DH, and I all just having a chat about what to know about TTC. I've been getting anxious lately because I know we're still in a holding pattern and feel like I should be doing more. My GP was fab though! Told me that yes, I can lose some weight, but not to take the BMI recommendations as gospel. Some reminders about food generally, some specific exercise recommendations, and guidelines for when we're ready to go, what to expect in terms of weight during pregnancy, etc.
I also got to witness the hilarious conversation of my husband asking if he can do anything to improve his swimmers, to which the doctor basically said, "Your job is to make the delivery. Everything past that is support." 
His main final point was to not get overly stressed about it. Read some, research some, but at the end of the day, do whatever comes naturally to you. Which...kind of dumb, but it was nice to hear a medical doctor remind me to mellow out about everything.
That said, I'm sure I will not even a little bit feel that way when we actually start, but the reminder is always helpful!