Hello and welcome! I am still experimenting with what will work in maintenance -- just reached my goal weight last year. (Down 110 from 260 to 150.) I sort of have the idea of losing additional weight in the back of my mind, but that's mostly because the scale number is higher than most people are at my size (I'm between a 2 and a 4 depending on the brand).
Anyway, for now my goal range is supposed to be 5 pounds on either side of 150, although my lowest so far has been only 149.4, while I've been up to 154.8 a few times -- generally at "that time" of the month, and it's mostly water. Other times I tend to be between 150 and 152. I weigh every day, but try not to worry too much as long as I'm in range. I think I would worry more if I started to see a lot of 154's (other than when I'm PMS'ing). I chose a 5 pound range because I saw that's what some other successful maintainers had done, and because it seemed to fit with my "normal" ups and downs. Though of course I'm still trying to figure out the "new normal"!
I am about to embark on fertility treatments myself -- although ours is male factor infertility, we have to use ICSI, so I will have to do the full-on IVF hormone regimen. Not looking forward to that AT ALL, and worried that it will undo all of my hard work in the weight department. I've lost 100 pounds once before and regained it -- and it took me almost 8 years to try again. Not sure I have another round in me, so have to maintain it this time. But of course the biological clock is ticking too (I'll be 40 in June) -- and one of the reasons I lost the weight this time was to help me become a mom! I am encouraged by your success (and yes, though you have had a gain over time, you are a success!), and your ability to keep from falling off the wagon during that stressful process.
Good luck meeting your renewed goals this year -- and congratulations on keeping off 60+ pounds for nearly 5 years! Even without the fertility drugs, you're totally beating the odds.
Starting Weight: 260 lbs. (November 2010)
Quasi-Maintenance: 165 lbs. (June 2011)
Goal Weight: 150 lbs. (reached December 8, 2011)
Size 22W to Size 4
Currently maintaining within 5 lbs. (+ or -) of goal. I weigh daily, but also use a tape measure and the fit of my clothes to guage how well I'm doing.