Dd was totally, completely, cry-every-month planned. It took us the better part of a year to conceive her and we were thrilled when we found out she'd be joining us. With this one... a little bit of a surprise, but a very welcome one. We weren't using any birth control, but we had just made the decision to wait another year (probably about two days after we got preg!). We're both thrilled and since my brother and I were 22 months apart, I feel pretty good about my two being 23 months apart... like it's something that I already know and "get".
As for headaches, I used to get them all the time but haven't since I started seeing a chiropractor regularly. Made a HUGE difference in my overall health.