Grrr fed up

I am 3 days off my fertile time from Thurs Fri Saturday n I am still on all be it so very light n it's brown sorry for tmi.

But I so want to try my hardest for a girl as it really is my last as not only am I 39 and my partner is 40 but I have 4 boys.

I read a few articles about this and a friend and others have had success of when to try etc so I am doing this but how can I when I need to try before I ovulate and at being of fertile time as much as possible if I'm still spotting.....looks like October's also going to be a no go again 😣😭