I had unprotected sex on the 16th of july which was the same day i was ovulating,but he did not cum inside me.5 days later i wake up to mild bleeding but it stops. the next day i wake up again to see mild bleeding. i'm worried as to what it could be?

At this point in your cycle it is not possible to draw any conclusions from this small amount of bleeding. Pregnancy is still a risk even though you took some precautions, but it is still too early to do testing. The situation should become more clear over the next two weeks and meanwhile you need do nothing else unless you start getting additional symptoms.

It is difficult to- mild menstrual irreg.- trauma etc. If worried about preg pl get tested. Unprotected sex even tho it might seem safe by ejaculating outside can be a wrong perception at times- so good idea to use BC method next time. Good luck