You shouldn't mess with here in a sense of bothering or pestering her just for fun. Sometimes during a girl's cycle, she can become very irritated even when she's trying to remain calm. And if by mess with her, you mean have sex with her then it would depend on your consent and hers.
Having your period should not affect the results of a drug test. Menstruation does not impact the chemical composition of your urine or blood in a way that would alter drug test results.
maybe. you should talk to your doctor.
yes, but you should talk to your family doctor.
having a thyroid goiter mess with your sence of smell
No it can not mess up your Period it can just make it flow faster hope i Helped!
Yes it can, the stress on your body can throw your cycle all out of whack!
Yes
Hey sweety The only way to delay your period is to go on the pill then, after the first month, you can pick and choose when you get your period. Fingering yourself will make no difference whatsoever.
No. Not unless they are already finished. If you are a good friend, you will not mess with his relationship, and if you do mess with it and she dumps him for you, she will probably dump you for someone else, too.
Crossing your legs can mess up your hip alignment if you keep them crossed for an extended period. You should try to sit with your legs straight often.
She probably makes a mess in her undies. It's not horribly uncommon for periods to be somewhat irregular, but it might not hurt to see a doctor about it just to be on the safe side.
The pill can really mess with your sytem and make you have a period for a month and then skip. I really can't say but after a year you should be having regular period. I would go see a doctor.