Getting anxious

Starting to get anxious i was diagnosed a long time ago with PCOS and knew one day I would run into problems getting pregnant. I conceived my daughter who will be 6 in October naturally. Me and my husband decided it's time to add another little to our family. We have been seeing a fertility dr since the start of summer iv just done my first round of letrozole 2.5mg and go for blood work Sunday to find out if it worked or not and I'm getting really anxious just have a gut feeling it didn't work but that's ok there's always next time just trying to stay positive.