Thanks for writing to us.
If you had periods just 2 days after the unprotected sex, then it is not an implantation
bleeding. It takes at least 7 days for an embryo to get implanted in the uterine cavity
after fertilization. Please do not worry.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Rakhi-Tayal