postpartum bleeding?!

I had my son 8 weeks ago.. I had the postpartum bleeding off and off for 6 weeks adn this just stopped about 2 weeks ago.. however now I am spotting all over again.. I started spotting yesterday a little then over night it got really heavy and its done all over again.. should I be worried.. I mean I never had problems before having my son.. I am also breastfeeding so I didnt think I would start periods again for a few months since with my daughter I didnt start again til like 5 or 6 months later.. but even if it was me getting periods again that isnt normal is it? I am just concerned as to what I should think and yes we have been having unprotected sex because I didnt think that it was near time I would start cycling again..