Is it normal that when toning Ginoring withdrawal bleeding is quite abundant, not as standard as during ordinary menstruation?

Good morning, It's the second month of my use of the Ginoring krazka. The doctor told me that I can use the krazek without interruption and replace it every 28 days at the same time. So I did the first month and then when, according to the leaflet, there was to be a withdrawal bleeding (21 days of use + howl and 7 days break) this bleeding was not, as the doctor said. Now it's the second month and I did as before. Currently, I am in this "7-day break" and the bleeding has occurred, enough abundant, but not as standard as I had during the usual month. Is this normal? Can I be pregnant? I will add that in the meantime the krazek was all the time in the snaff.