TTC with ED

So I’ve been with my significant other now for a year. We have decided to ttc. I’m 33 and have 2 children from a previous relationship and he is 39, also with a child from a past relationship. We have great chemistry and it’s always explosive in the bedroom.. But he does struggle with ED. He always makes sure that I’m taken care of but doesn’t always orgasm himself since he can’t always sustain an erection. He is diabetic and on insulin also trying to manage with diet and exercise. He isn’t severely overweight. He is about 5’9’’ and 240lbs. How am I ever going to get pregnant if he can’t perform fully? Anyone else deal with this? I’m trying to get him to talk to his dr about viagra or cialis but he’s embarrassed. I keep telling him that he is way to young to just be ok with this. Any tips or tricks to help us along are appreciated! ❤️