Help! Should I test again?

Jennifer
Hi everyone, I need some advice please before I think myself to crazy land!
Came off the pill 3rd Jan 2016 and had first period 19th Feb. We're ttc baby #2 but as this is month three we're not tracking or charting etc (yet!).
My fiancé and I had sex a few times when I was 'supposed' to be ovulating but as this is new I'm not necessarily sure I was even ovulating. Still no AF and should have been due by 18th March if on 29 day cycle. It's now a 39 day cycle and I've done two clear blue digital tests (5 and 2 days ago) and both BFN!
Would any of you wait for AF or try another test that wasn't digital now? Thanks xx