Femara and positive opks! Why have I had 3 now???

Leslie

This is my first round of Femara. My cycle is erratic...anywhere from 30-59 days so I have no idea what my ‘normal’ is. I have had a positive opk on cycle day 8, 16, and now cycle day 20. Which one do I believe? The darkest one? That was cd 8 and that’s so early...and I didn’t bd ☹️ Any advice or similar reactions?