6 week 6 days and ive began to bleed

ive been feeling sick all day today .. again, which i took as a good sign. but today i had no choice but to go to walmart for more food and formula with my 10 month old son, (walmart is 1 hour away) so i was out like all day today and i had to carry my son everywhere .. anyways i just started bleeding its not heavy .. yet.. but yeah i dont know if i was just doing too much today or if this is yet another miscarraige. now im really freaking out