Starting 4th clomid round - ROBITUSSIN doubt

Natalia 🧡
Well, last month wasn't my month... Again. Today I'm starting clomid, in the 2nd cycle clomid didn't work so I'm nervous that the problem it's from this ovary.
So basically I'm trying a lot of stuff, BD every other day since the trigger shot, pre-seed, legs up after BD. I have read about the robitussin so I think I will give it a try because my cm looks kind of creamy during my fertile window. Synce last month I ovulate on CD16, when do you think I should start the syrup and when should I stop?