Hormones?

I had a baby 8 months ago and just got my first period in November. I am usually never irritable or moody. I never realize when I ovulate either. My cycle is very irregular so I never bothered to track it. My last period was December 26-31st. It seemed normal to me. Well someone said that I could be ovulating and that’s why I have spotting and cramps but I never notice when I ovulate. I never have spotting. This spotting was pinkish brown and I had cramps with it. My husband and I had sex 2 days after my period was over so idk if I could be pregnant again or not. But I am super stressed over nothing, irritable, moody. Even depressed. What is going on?