Clomid & Late AF?

Jenny • TTC almost 1.5 years now. I`m 37 & husband is 35. First pregnancy for us both. Praying for a miracle!
I am 37 TTC our first child. After almost a year and a half of trying I had a round of Clomid. I had my blood work done last week to determine if I ovulated and they did a pregnancy test as well. I definitely ovulated but not positive. I am however late. Does anyone have experience with this? I'm wondering if AF is typically late after Clomid. Still going to test again Friday.