Need some help 10 days late for AF

So I took a month of charting and it’s Sod’s law I’m now late for AF. Started citalopram in April but had a regular cycle that month since starting it. But now nothing.

Had sex a few times over the last month, had some spotting on the 19th and 25/26th just enough to notice if I wiped and tiny amount on a pantry liner. But presumed AF would be coming. Well she hasn’t turned up OPK are negative and HCG are negative also. Just wondering if anyone could give me any advice?!

I have booked a GP appointment but can’t get one until the 18th June. 🤷🏻‍♀️