Should I call my doctor?

I’m 13 weeks postpartum and I had my little boy via c-section. 5 weeks postpartum, once I had stopped bleeding, my doctor put me on birth control. I got my first period back on October 2 and it lasted 14 days. Two weeks later the next period started and it stopped on November 6. Today, November 13, my period started again. It just seems like it’s starting way quicker than what it should. I’m beyond irritable and my anxiety’s through the roof even with being on Zoloft. The cramps aren’t horrible but I definitely know they’re there. I just need to know if this is normal for postpartum on birth control or if it’s something my doctor needs to know about.