With my first i had bleeding for 3 days tought it was my period. Soon found out i was pregnant i just felt it i still bled every now and then shouldn't be serios if its light with no pain but still see a doctor soon to rule out ectopic
As long as its not too heavy and you don't have any pain you should be OK. My mom and sister had what seemed like period volume bleeding throughout their first trimesters. No misscarages between the two. But you know your body best. If you feel like something is wrong make a trip to the er. Best wishes!
It could be Implantation but if it keeps happening & youre worried about it, go to the er or ask to see your doctor.