Ttc after cerelle

I came off my pill about 4 weeks ago and yesterday I started bleeding, today’s it’s a lot worse and I’m getting cramps aswell, I’ve read about the withdrawal bleed does anyone know roughly how long it lasts? Looking for peoples experiences coming off cerelle mini pill. What are some other side effects you’ve had coming off this type of pill as I’ve got cramps, hip pains and back ache aswell?