Welcome to HCM,
It is not clear that whether you had sex on 4th July or since 4th July?
You had sex with protection or without protection?
If it was with protection, why unwanted 72 was taken?
Any way, if you had sex only on 4th July with protection, took unwanted 72 also within 1 & 1/2 day (36 hours) and had your period also on 6th July, then you can't be pregnant.
If you are having intercourse since 4th July with protection, then also probability of you being pregnant is very low, provided condom remain intact during every intercourse.
In a regular menstrual cycle of 28 days ovulation generally occurs on the 14th day of menstrual period and next period starts on 14th day of ovulation. If ovulation is delayed due to any reason, period will also get delayed.
You should get pregnancy
test done. If it is -ve, wait for period and if it is +ve, contact your Gynecologist.
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