Confused about Clomid

So I’m 30 and this is my 11th cycle ttc. Cycles usually 24-26 days, regular, and I always get positive OPK usually day 10-12. When I was temping, I also always saw temp shift. So I know I’m already ovulating. Husband has normal SA but known varicoceles. AMH, progesterone, TSH and testosterone for me all look “really good” says fertility doc. But she’s prescribed 100mg Clomid for me to start taking. Now I know normally the chances of conceiving each month is 20-30%. I asked her what the chances with Clomid are and she said “with <a href="https://glowing.com/glow-fertility-program">IUI</a> 20% each month, or for what you’re doing (timed intercourse), about 10%. So my question is... WHY would I take clomid if it makes the chances of conceiving LOWER than normal?? Can anyone make sense of this? Oh and btw I read it can lower your amount of CM, which I have very little of anyway..