Welcome to HCM,
In a regular menstrual cycle of 28 days, ovulation generally occurs on the 14th day.
Your period most probably started on 1st of July, therefore 14th July might be your day of ovulation. Thus it was your most fertile period.
Unwanted 72 pill is generally effective, but success rate is not 100%.
It can only prevent or delay release of egg from ovary, but it is not effective if one is already pregnant. Though it is clammed to prevent travel of fertilized egg down the Fallopian tube
and its implantation
, but it might haven't got sufficient time to make changes.
You should confirm, your urine pregnancy
test with blood test
Thanks for trusting Healthcaremagic and posting your query.
Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma