1st cycle metformin

So this is my first cycle using metformin. I know I ovulated sometime between oct 17-22 because I used ovulation strips (didn’t exactly pinpoint ovulation). AF was supposed to come yesterday, but no signs.

I have cheapie pg strips that I bought off amazon last year when we had our mmc. I’ve taken two and they were neg but I honestly don’t even know if they work or not. I need some advice because it’s driving me insane. I don’t know if I should expect AF soon or if I should go ahead and just buy a store test. I just don’t want the disappointment of seeing negotiate again.