Everyone's TTC journey is different. Even if you folow anything that should have been done to TTC it wont guarantee that you will conceive. Some people take years, me and hubby took 2 years, some of my friends took longer. 3 months is seriously short. Give yourself more time and stop thinking too much. TTC is not a project with confirmed dateline.
I am not sure if you have the correct information about implantation bleeding. I remember reading about it happens about 1 week after conception. I thinj the theory u read is they assume conception is only done during your calculated ovulation time. But not everyone's ovulation is accurate like a clock.
As a gynae told me, stress about not conceiving is one of the biggest issue for unsuccessful TTC.

This post has been edited by lowlowc: Oct 11 2018, 07:27 AM