Fertility question!! ๐Ÿ™ˆ

Millea โ€ข Fiancee ๐Ÿ’š twin angel girls 2017 ๐Ÿ‘ผ๐Ÿ‘ผ , ๐ŸŒˆ rainbow IVF Miracle A-R 2019๐Ÿฅฐโ™ฅ๏ธ

So today I got prescribed Letrozole 2.5mg Iโ€™m just wondering when in your cycles did you take yours? As Iโ€™m not guaranteed to ovulate so would it matter when I take it? Iโ€™m on 5week cycles atm.. ๐Ÿ™ˆ๐Ÿ™ˆ sorry Iโ€™m a first timer on these.. Iโ€™m cycle day 9 and eager to start

Edit::: so I started them and iv had constant spotting and mild period pains ... is that Normal??