Multi-select problem: How does the next paragraph end?

How to determine why your period is late
Consider the possibility of pregnancy.
One of the most well-known causes of a late period is pregnancy. When you become pregnant, you no longer shed the lining of your uterus, which is what causes your period each month.

Available choices:
--In this case, your period may be heavily delayed due to delayed birth control and blood thinners. Ask yourself if the problem has been created by a cause other than your body.
--This is especially true if you are carrying a preterm pregnancy and are pregnant a few times in a row. Any pregnant woman who fails to have a period or luposes for at least seven to nine months can have a late period.
--If you are sexually active, you should consider pregnancy as a possibility-even if you are careful. No form of birth control is 100% effective, so there is always a chance.
--Other conditions that can cause a late period include fluid accumulation of menstrual urine, polycystic ovary syndrome, low blood pressure, and yeast infections. Your doctor will help determine the underlying cause of your period which may make you more likely to carry it.
If you are sexually active, you should consider pregnancy as a possibility-even if you are careful. No form of birth control is 100% effective, so there is always a chance.