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Can any clever folk shed any light on why my period would suddenly be a week late?
Think about whether anything stressful or upsetting happened around the time that you normally ovulate - your body may have delayed ovulation a week, which means that everything else would be pushed back as well. Toni Weschler talks about it in her book Taking Charge of Your Fertility - a book I've found really fascinating.
A change in routine like travelling/holiday or stress can delay or even prevent ovulation which will in turn delay your period as you usually have a similar length luteal phase (the time between ov & af) each month.
The 2 biggest times I've been really stressed my cycles have been stupidly long because ov just didn't happen.
In my defence, I've been successfully avoiding being pregnant for 20 years, apart from the one time that I did want to be pg and succeeded first time. So I've always been quite confident that I know what my body's up to.
But that said, of course things change, and of course one shouldn't be cavalier about such matters
I've just had a similiar experience - my period was only 3 - 4 days late, but, I'm normally like clockwork and have also had the mot HORRENDOUS pmt. I know so much can affect your period, but its strange when for years and years you are regular!