Well, first off you had a T.L., so most likely your not pregnant? As for the periods not being there..I used to be irregular like that for years before concieving my baby. I took home tests for 2 months with all negatives, before I finally got a positive, then wen to the doctor for a confirmation. Bottom line is you NEED to talk to your doctor about all of it.
1. ARE you pregnant? Why are your periods so far apart..I had been tested so many times over a 4 year period for that same issue. You may not be even ovulating, but I am not surehow it works with a T.L. cause I thought that was the point of a T.L.?? Anyhow, that needs to be checked, it could even be something as simple as you being a bit anemic and needing some extra vitamins.
2. If you had a ligation and you DO want another child, then most likely you'll have to talk about a reversal, they are really not that difficult to do nowadays, depending on the process they used to do it in the first place.
Either way good luck to you and your family, and just go talk to your doc.