Fatigue post partum

I'm almost 3 months PP and still get so tired!!!! Anyone else? I'm EBF but baby is now sleeping around 7-8 hour stretch at night (knock on wood) but I still feel tired especially now mid day after doing groceries, food prep etc. I hope this gets better by the time I go back to work in 6 weeks!! I don't drink any caffeine since I am BF but started a B12 vitamin to see if that helps. I don't remember if I was this tired with my older daughter (now 4)