When should I take clomid?

We just found out my fiancé has low sperm motility which means his spam isn’t moving as fast as they should but in the right direction.. I don’t ovulate so that is why I’m on clomid but my doctor said go ahead and keep trying until his urologist appointment but I didn’t have the chance to ask what days I should take clomid on for the best chance now that we know it’s not just my ovulation problem! What do you guys think the best chance is with low sperm motility??