I am supposed to start my first ivf cycle in my upcoming cycle. My lmp started on 15.07.2019 and I was prescribed duoluton-l by my doctor from 17th july to 31st july, she told me that i'll be getting my periods within 5 days of stopping it, its been 9 days since I stopped as per her instruction, but from day 5, i've been having very light brown spotting, 1 drop per day. No bleeding. How does duoluton-l work? Should I be worried?