Ejaculation problems

So me and my man have been trying to get pregnant for sometime now and haven't had a problem with him finishing the last 3-4 months. And this week is my ovulation week and we have tried to have sex twice this week so far and he can't complete it. And today after a long unsatisfying round for him he started vomiting (normal for him in the mornings when he first wakes up). Anyone else's man have problems completing the dirty deed? Lol