advice ? late period no bfp started to spot

Today marks two weeks and one day and still no bfp?!? My period has never been this late and today I started spotting a tiny bit while at work my boobs are sore I'm just so confused and my doctor said he doesn't want to do a blood test until my second missed period is that even allowed ?! Uhg any advice on how to stay calm and keep my cool through all of this until I have answers .. how long after your missed period did you get a bfp? Just curious