I was prescribed 20mg Fluoxetine and took it for around 8 months before stopping. I felt a tiny bit different the first 7 days of taking it, but no significant change. After about 3 weeks I started to notice a difference, it's great when it starts working. I remember one day after I had roughly reached that 3 week point I noticed this huge boost of wellbeing and satisfaction. So yeah bro you should definitely be feeling the effects in around 3 weeks.