some women have a slight show of blood / Implantation
bleeding - which is often very light in color and short. This would occur approx. 6 days after conceiving / getting pregnant.
In a 28 day cycle you would expect the ovualtion to be around day 16 of the cycle (12 days before the next period starts) - so , yes , that would bring you to day 22 of your cycle.
However with the symptoms you had - it seems the show of blood might be due to something else.
Maybe even a belated side effect of the HSG
The symptoms you were having would not be pregnancy
Seeing as the body wouldn`t even know it was pregnant itsself until implantation has occured!
I would connect the symptoms to other things rather than pregnancy.
Which still doesn`t exclude the fact that you should take a pregnancy test at home in another couple of days.