How many IUIs before IVF? And when can I test?

Hey guys,

I just did my 3rd IUI on Sat. August 3rd, this time without any trigger shots. Just 5 mg of Letrozole on CD 3-7.

I had 2 follicles, 23 mm and 18 mm, lining was 12 mm and sperm was 14M count and 77% type b.

Just wondering how many IUIs are you doing before considering IVF?

And when can I do a pregnancy test at home? Since I didn’t trigger this time... my beta is scheduled for Aug. 16. But I want to do a home tests before then.... when should I do one? How many DPIUI should I do one?

Thanks!