Hello and welcome to EmpowHer,
I'm so sorry that you went through cervical cancer at such as young age.
Irregular bleeding, especially heavy bleeding between periods can be a sign of cervical cancer. Since your bleeding is so unusual and you have had cervical cancer in the past, I highly suggest that you see a gynecologist as soon as possible.
Below I have pasted a link to a HER article explaining more symptoms that may point to cervical cancer: