Welcome PollyIndia..
So, I've just been doing some 'research' on the sore boobs thing, and it does seem it can just come on at anytime (even if you haven't always had it) due to age. Great. Apparently it's down to oestrogen dominance/high oestrogen which is a problem in itself but it then causes low progesterone as it sort of elbows it out. Worsening PMS is a sign of it apparently ie the sore boobs, irritability, headaches and so on. Sounds like me!
I've done loads to try to reduce it, with my diet and lifestyle etc and I have to say the irritability and headaches are so much better but the damn boobs are still sore post-ov. Hmmmm.
Cleo - apparently yes low progesterone can cause luteal phase defect (which like you I don't have problems with).
I have to say that I do think all this is age-related but if you look around other threads it seems like there are loads of younger women with very similar issues, and worse.
So ladies, to boost progesterone here's what i read - maintain healthy weight as fat stores up oestrogen, reduce stress as stress uses up your progesterone, stay 'regular' by eating loads of fibre as it ushers the excess oestrogen out of your system, quit or reduce caffeine and booze, do some exercise (i'm v guilty of this one) and eat foods high in Vit C, Magnesium, B6, Vit E and Zinc. oh and try to avoid drinking out of plastic bottles and heating food in a microwave in plastic. Supposedly plastic contains fake oestrogens which mess up your hormones. phew.