I think you need to get off the pill, and onto prenatals and give it a few months to get out of your system.
That way your hormones can balance themselves out again and you can have some time to get used to the idea.
One thing to remember though, I don't know if you're breastfeeding or not, but if you want to continue BFing longer, you may want to wait a while to get pg. A lot of women experience a change in their milk when they fall pregnant and the children tend to wean themselves. So if you don't want to lose your supply you may want to wait a little longer.
It's also a good idea to get all the crap (the pill) out of your system for your PND. Having extra hormones flying around can't help.