Yes, I had low-level headaches for about weeks 6-9. This is because of all the changes happening in the brain - the prolactin levels growing so you can breastfeed, in those weeks my prolactin levels rose about 4-5 times their usual level. The gland that makes the hormones (the pituitary gland) is growing and it can sometimes press upon the optic chiasm, which makes your vision go a bit blurry and makes focussing a little more difficult (I had this weeks 6-9 too). This can also cause the dancing spots before your eyes, but that's linked into my dizziness as well, so I just have to take things slowly.

My only remedy has been to close my eyes and calm myself with meditation, as I won't take pain killers, and imagine my skull expanding to fit in all the extra brain that's growing. Either that or not read and watch TV at the same time because going from one near-focus to a far-focus quickly and constantly has not been too good for me.