Postpartum Symptoms?

I'm three months post partum and I had my first period a little over a month ago..Last week I had a couple days of EXTREMELY light spotting but no period..I've had some nausea on and off, very light cramping here and there, moodiness, and tmi: wetness..I spotted once again, last night after sex. These are all symptoms I had in the beginning of my last pregnancy but I wondered if it was common to randomly start experiencing these postpartum?

I'm not currently on birth control..I started it last month and quit two weeks in for medical reasons.