When I woke up I noticed I didn’t pray fajr. I’m pretty sure I made it up after I woke up but I’m not 100 percent sure. A few hours later I was in a hurry and prayed my dhuhr and I left. The next day I am starting to doubt whether I made up my fajr or not. Should I disregard the doubt because I’m pretty sure that I made it up, or should I make it up again just in case? (I’m pretty sure I have whispers of shaytan if that helps you answer)
Salah/prayer must be prayed at the prescribed time :
After performing the ritual prayer, continue to remember God- standing, sitting, and lying on your sides- and once you are safe, keep up regular prayer, for prayer is obligatory for the believers at prescribed times.
Try to pray on time in that case you will be 100% sure that you prayed Salah/Prayer. If any case you missed Salah/Prayer then you can pray that immediately after remembering it.
These may help you in remembering your prayed Salah/prayer:
You can also download any Salah/Prayer tracker app, there are alot of apps which help you keep track of each salah/prayer
You can make a schedule on a piece of paper for all obligatory prayer and after praying a salah/prayer, just mark it on the schedule