Feeling discouraged

Skylar
I am feeling so discouraged and I know it's silly because I haven't been trying for very long. This is my third month TTC and AF is due tomorrow. I took a test today and BFN. Last month I tried tracking everything, I was very precise with my ovulation etc. this month I've tried to stop stressing and just listen to my body to let it happen...I've been eating very healthy, exercising and taking lots of good supplements to help me ovulate as I have PCOS and wasn't regular.. Last month I started my period 7 days after ovulation.. I just don't know what's wrong with me :-(. I'm 26 and I have a 5 and a 3 year old who I both didn't try with. Why is it so hard now? I have no symptoms so I really am not expecting to be pregnant this month. I guess it's still possible but nothing's showing up on a first response so I've just lost hope. :-( any encouraging advice is much appreciated :-(