Clomid Help!

Hey all. My husband and I have been trying for 3 long years. We recently went through all the fertility tests and everything looks great, we just have unexplained infertility. Which I’m thankful we are healthy but upset we can’t pin point an issue. We are very healthy and active individuals. Anyways here is my question. This is my first cycle taking Clomid days 5-9 as prescribed from my OBGYN. I’ve been testing my ovulation since day 10 since I normally ovulate on my own on day 13. Well now I’m on like day 19 and for about almost every other day I keep getting these lines. There has been a line since like day 11 very faint or dark. It goes back and forth. I’ve used a different box too bc I ran out. Does anyone know why?!