Ttc but very messed up cycles

So bear with me while I explain. I came off the pill in October and had a withdrawal bleed. After that, I had nothing until mid January which was I guess my first normal period. However, if I went back to how I was before I was on the pill, I had period every 4 weeks. Which would’ve meant my period should’ve come this past week. But nothing. I’m so worried that my cycles are going to be very long so my chances of conceiving are very low :( I got pregnant with both my children the first month after stopping the pill. Oh and pregnancy is not possible since we weren’t active after my last period.