Ugh!! Irregular periods

Cheyenne • I an 27 and I have a 3 year old boy, 6 year old boy, a 7 year old little girl, and 16 month old little girl
I am so upset. I got off of the nexplanon 2 months ago and I finally got avregular period on the 31 and then I thought I was ovulating but nope! I started another period on Wednesday and it is still going. I thought it was implanation maybe but I doubt it cuz it have been 3 days and it hasn't stopped. Has anyone else gone thru this? I really need some help :(