That's a really good point!!Another perspective - if you are definitely wanting to return to work (somewhere), it can be a good thing to go back to your old job for a while where you have a work history, particularly if they are nice and flexible, in case you need time off.
We have no family around us so the kids had to go to daycare when I returned to work, which meant of course they spent most of the first year getting sick. Each time they were sick either dh or myself had to take time off, so I really felt that my best option was to return to my old work where I had done the hard yards and they knew I wasn't a slacker!. I couldn't think of anything worse tan starting a new job then having to take time off in the early days because the kids are sick!.
Plus it was quite daunting going back to work after mat leave, it's a whole new routine to eat used to, so it was nice to go somewhere familiar where I knew the people and what I was doing.
Whatever you decide though I second everyone else, do NOT resign now but keep your options open!.