Laura - I'm pretty much identical to you. If I am on a 28 day cycle, AF is due today. Last three cycles since coming off the pill have been 25, 30 and 27. So I'm really not sure if I am late or not :( Did two tests today, both negative.
This is like torture. I keep going to the loo to check. I usually get a sensation when AF makes an appearance, and I'm getting that but nothing. I literally cannot take this 
But....I have been really ill these last few months. Headaches, hot flushes, cheek burning. I kept going to the doctor, who terrified me by mentioning early menopause (FUCK!) but she did hormone tests, and I have periods so you know...She concluded it must be work stress.
Anyway! My DH is a personal trainer, and I went to a session yesterday morning before work. I was dying from hot flushes on the train to the gym, and felt faint and dizzy. DH's head coach was concerned, and later on DH called me to say the head coach has a client who is a leading women's health specialist in Belsize Park - he specialises in fertility, menopause, hormone stuff, etc and he arranged for me to a have consultation with this doctor in exchange for my DH giving this guy a few PT sessions. I could have wept from the kindness, and also the opportunity for someone to tell me what the hell is going on in my body.
Re gymming - on the advice of DH and his colleagues, I've been kettle belling and swimming as usual. Tuesday morning I was practicing free standing hand stands at 7am 