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Either is fine, but every three weeks is more expensive. Try every four weeks, and if you have breakthrough bleeding, go to every three weeks.
Yes, it's normal to bleed 1-2 weeks.
depends on how much harm was done
No, fitness cannot be achieved by working out every two to three weeks.
4 weeks pregnant is when your period is due, this may be a period or if it is really heavy and you have had a positive test I am afraid you are probably having a miscarriage.
Every three weeks
Every four weeks. Because if you trim it to much (like let's say ever two weeks) you will trim it to short and it will bleed.
Sesquifortnightly. Sesqui is a prefix meaning one and a half, like in the word sesquicentennial. A fortnight is two weeks. Every three weeks, therefore, is sesquifortnightly.
No this isn't normal. See your doctor about changing the pill.
You have to see a doctor. It's not good for you to bleed that much every month and it's not normal.
every three weeks
Every three weeks at the least