Hope it goes well for you Sasha. I had my first shot same time as you and then had another in the Dec. I didn't have AF at all the whole time, but i had constant old blood leaking. Not much just annoying.
I've had 3 AFs since but like the others said my regular 21 day cycles are no more. I did do the research and at the time it was the best option for me. I won't be doing it again though.