Welcome to HCM,
Thanks for trusting Healthcaremagic and posting your query.
The bleeding due to implantation
occurs generally about a week before your due date of menstrual period.
It is very light/spotty, and doesn't continue for three days.
Color of bleeding is pinkish.
Thus your bleeding seems to be due to period only.
To improve your chances of pregnancy
you should have sex around day of ovulation.
Please semen your husband tested.
If his report is normal, please consult a Gynecologist for your checkup.
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,