I had an eptopic pregnancy almost 2 years ago, which ended in the removal of my right fallopian tube. Right afterwards I had very regular periods, 4 weeks on the dot. Four months later I got pregnant. It's been 6 months now since I had the baby. 4 months ago I started getting my period again, but ever since it's been irregualr but still around 4 weeks. I'm at the point now that it's been 6 weeks since my last period and I've taken a pregnancy test but it's negative.

I'm wondering if it's normal to skip a month since I have one fallopian tube?