1) Abed 2) Ailing 3) Indisposed 4) Laid up 5) Menstruating 6) Peaked 7) Poorly 8) Sick 9) Unhealthy 1) Ailing 2) Bedridden 3) Below par 4) Confined to bed 5) Frail 6) Ill in bed 7) In poor health 8) Indisposed 9) Injured 10) Laid up 11) Menstruating 12) Not a hundred percent 13) Not at your best 14) Not healthy, ill 15) Not thoroughly out of sorts 16) Not well 17) Off colour 18) Out of sorts 19) Poorly 
• (a.) Specifically, ill from menstruation; affected with, or having, catamenial; menstruant. • (a.) Not well; indisposed; not in good health; somewhat ill; ailing.
May mean menstruation as well as the obvious meaning
Unwell: Not well or in good health, ailing, sick, indisposed. For example, 'I am well-nigh choked with the sulfurous heat of the weather -- or I am unwell.' (1826, Journal of Sir Walter Scott) 'Unwell' is also a euphemism for experiencing menstruation. It medicalizes women with the implication that the menstrual period is always a time of illness. ...
not well; ailing; ill. · menstruating.