TTC after birth control?

I have been on and off BC for a few years now. However after not using any for the whole of 2016, I began taking Rigevidon end of January this year, I stopped taking it end of July this year, and this is our first month of trying and without BC. I'm 4 days late, getting obvious BFN, so I am guessing that my body is just regulating itself again. Has anyone been on this BC? How long would it take to have a chance of getting pregnant after stopping BC? I am almost 22 and my husband is 23 ☺️