Lost!! Please help

I got my iud out on 9/20/16 and had some spotting a few days later. Then got a period on 10/9/16 that lasted the normal 5 days. I've been tracking on here and with opk and had sex during my fertile window on the app. This app says I'm due for a period 11/2 and my other app says 11/6. I've taken pregnancy tests that have all been BFN!! I don't know if I'm testing too soon or if I messed up my ovulation timing. Please some help or advice is greatly appreciated!!   This is my first time ttc.