Welcome to HCM,
Thanks for trusting Healthcaremagic and posting your query.
In a regular menstrual cycle of 28 days ovulation generally occurs on the 14th day of menstrual period. Thus expected date of ovulation was 28th July.
As average duration of your menstrual cycle is 27 days, expected date of ovulation in your case was 27th July.
One can become pregnant due to intercourse done on or around the day of ovulation.
But you had sex about 5-6 days prior to expected date of ovulation. Thus chances of pregnancy
due to sex on 22nd July are poor.
Thus your bleeding/spotting seems to be due to ovulation .
You should consult your Gynecologist for examination and confirmation.
Hope you found my response to your query informative and helpful.
If you have further concerns in this regard, you can submit those with Healthcaremagic as well.
With good wishes,