Is it normal for me to bleed only once during treatment with Slinda?

Welcome. I started taking SLINDA a month after giving birth, before the onset of the first menstruation. I got bleeding while using the first blister, which lasted 10 days. I used 2.5 more blisters and the bleeding didn't come. I stopped taking Slinda three weeks ago (at the time it was half 4 blisters). Withdrawal bleeding did not occur, menstruation also did not come - I know that there is time for half a year. Negative pregnancy test. The question is, is it normal for bleeding to occur only once? More than 100 days without the slightest spots. Please advice. Thank you very much