After my first child, and I went back, on the pill, I did feel I was moodier than anything, blamed it on the pill. I spoke with my ob/gyn, and decided on a different method of birth control. During my third pregnancy, my then h, had a vasectomy. So, for a while, the pill was a non-issue.
I started using it, again, early, last year. It helped me, not as a birth control, just regulated my cycle, a lot better, than where it had been. And it's also, used as ovarian cancer prevention, being at high risk for that. I didn't notice, anything unusual with my moods, this time around.
One thing, could be, to talk with your doctor. And also, take a peek, at anything in your current life, that is troublesome, even to speak with a pdoc, just in case??