How soon can you get pregnant after stopping BC? And what tips for TTC?

This is my first month TTC and AF looks likely to come today or tomorrow. I have taken 2 HPTs and both with a negative result. I have taken BC pills for 12 years. I figured that might have something to do with my inability to conceive. Also, I was worrying about TTC and making sure my husband and I BD every day. I want to TTC the right way after AF. What are some good tips for TTC? Also, what effect does taking BC for so many years have on TTC?