Fingernails —
weaker, more brittle; hormones will be a little bit lower that means you'll have a lot of cycles, you know, symptoms with your cycle; you'll have lower libido; you won't be able to
recover from strenuous work out; you won't be able to put on
muscle, that's okay, no big deal.
I wouldn't recommend starting a training session (or especially a sports practice session) with them as fatiguing these support
muscles and the connective tissue in the area will leave the ankles temporarily
weaker and possibly more prone to injury (until they have a chance to
recover and strengthen).