I think it can.
Yes, being sick can affect your menstrual cycle by making your period late. Stress, whether good or bad, can have the same effect.
Becoming sexually active does not generally change your menstrual cycle. If you are using contraception, such as the birth control pill, coil or Depo Provera injection, then your menstrual cycle can change. Your periods may stop or they could become shorter and lighter in flow.
No, yogurt has absolutely no impact on your menstrual cycle what-so-ever. It's yogurt, it has no ability to change your hormones in order to change your menstrual cycle.
A pap smear will not affect your menstrual cycle.
Alot of things can change your menstrual cycle. Being stressed out, losing weight, and exercising can all effect your menstrual cycle.
No, Tylenol has no impact on your menstrual cycle at all. Your menstrual cycle is controlled by hormonal changes within your reproductive organs, Tylenol doesn't change this.
A sudden change in temperatures (eg. going from a very hot country to a very cold country) can have an effect, yes.
it could, but usually, no. 8 out of 10 chance it will not affect your menstrual cycle
As long as you still get your protein and enough calories, then no, it will not affect your menstrual cycle.
Yes, Prozac can affect menstrual cycle. If it keeps affecting it, you should mention it to a doctor.