Came off Yasmin pill, no period after 5weeks

I decided to come off Yasmin pill after 10 years as I was on it for my acne which has cleared up. However i had a period as soon as I ended it but not had another one, it’s been just over 5 weeks since my last period and I’m usually pretty regular. Anyone know why I haven’t had one since? I have taken a pregnancy test to completely rule that out and it was negative 👍🏼