No af after coming off pill

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Decided to come off pill to ttc. Took last pill on 11/12/17 had a break through bleed as normal which started 17/12/17 and lasted until 21/12/17. I’m currently on CD 91 with no af yet. (Whilst on the pill I had a 28 day cycle) So it’s been 13 weeks and 5 days since the break through bleed. I’ve taken hpts in December and January but all bfn not taken one since then. Been having unprotected sex since coming off the pill. Dont know if I’m ovulating or not.. How long does it take for periods to return to normal after coming off bc? Could I still get pregnant even though I haven’t had a real af yet? Any advice would help so frustrating ☹️! x