femara, 16dpo, no AF

So, I've never posted; but read religiously. I'm in my 4th month of taking femara days 3-5 of AF. currently 16 dpo and no af yet, which means I'm 1 day late so far, this has never happened!!!! I'm overweight and on metformin to regulate pcos. DH is a truck driver which makes timing tough. I don't want to get excited as this may only be our 4th month with fertility help but our 5th year of marriage and trying naturally. it's so hard not to get excited but I'm so exhausted by all the bfn's. anybody in a similar boat?