It’s likely not your period. If you are bleeding, it’s probably still from birth. Your milk supply will “decrease” after the first few weeks as your body regulates to what your baby actually needs and you begin providing milk on demand. If concerned, try pumping for 10-15 minutes between feeds or consult with your Dr or a lactation consultant! As long as baby is growing and seems satiated, you are producing enough
I got my period 5 weeks pp and my supply dipped and she hated my milk and we had to do formula for 3 days. It'll come back don't worry
Some people notice a temporary dip in supply around their period but it is very temporary. Continue to latch regularly, lots of skin to skin etc