Period already??

Jessica • Together 8 years and got married 08-08-14. Expecting baby #1 !!
I am approx. 5 weeks pp and started bleeding again yesterday. Is this normal? I only bled a couple days after birth then turned to the normal lochia for a few weeks. I am also exclusively breast feeding. 
Anyone else get their period this soon? Or do you think it's something else that I should get checked out?