TTC with IUI

Li

Is it normal to have two completely different reactions to the same process? I mean last month i did 50mg clomid CD 3-7, trigger on CD 12 then <a href="https://glowing.com/glow-fertility-program">IUI</a> CD 13. No side effects whatsoever. This cycle 50mg clomid CD 4-8, trigger on CD 11 then <a href="https://glowing.com/glow-fertility-program">IUI</a> CD12. Headaches and nausea while on clomid, spotting for two days after <a href="https://glowing.com/glow-fertility-program">IUI</a>. Normal?