Take care of yourself. If he comes to you (too) soon afterwards tell him "not today. How about tomorrow?" Believe me. He won't be the first husband who's been turned down.
Moving into theory and speculation here, I believe that a woman's sex drive tends to go in cycles often driven by her monthly cycle so there are fluctuations in your desire. I have found that after sex, as a man, that desire steadily increases for a few days. If no more sex happens the desire does not go down.
This is to say that if you turned down your H he'll likely be just as interested the next day.
