First IUI - few questions

Jill • Happily married, had my first son 12/31/16 (conceived via IVF), ready to expand my family!
I just did my first and second <a href="https://glowing.com/glow-fertility-program">IUI</a> yesterday and Friday CD 14 & 15. Today I am CD 16 I have a few questions post <a href="https://glowing.com/glow-fertility-program">IUI</a>. Is it ok to have sex tonight? I have egg white mucus today with a little brown discharge, does that mean anything? I am trying not over think anything and just relax. Do most people do progesterone suppositories following <a href="https://glowing.com/glow-fertility-program">IUI</a>?