Heavy implantation bleeding or AF??

Kristen

Okay the 17th which was wensday I got AF which was a normal flow and then stopped early Friday then Saturday I starting spotting brown/pink which lasted a day or so. My AF usually last 4-5 days I’m just confused. I’ve had headaches,constipation,gassy,and even so tired. Just wanted to see what you ladies thought did I have a period and just shortened air could it have been implantation bleeding??