Anyone have to take Letrozole for 7 days at 7.5mg

Last time I took Letrozole 7.5mg for 5 days and it gave me a cyst. Then doctor switched me to clomid for two cycles, but that made me feel really sick during my period. Also had a chemical on the first round of clomid. Took a long break since covid started around my last clomid cycle. This is my last IUI before looking into IVF. I am scared that 7 days of Letrozole might not be ideal, but who knows. Anyone took 7 days of Letrozole at 7.5mg?