Having sex during your period will make the bleeding appear a lot lighter or stop completely. It's nearly impossible to conceive while on your period because there simply isn't an egg in your ovaries...or in the correct position to be fertilized.
Your period doesn't always become lighter or just stop after sex during your period. Mine tend to become heavier and a lot more. There is also a chance of getting pregnant while on a period, but it all comes down to your menstrual cycle. Meaning your period and ovulation time can overlap making it likely that you can become pregnant while on.
There is a small possibility of your period stopping if your overlap (period and ovulation) is at the start of a period. Because sperm can live up to 3-5 days the egg can be fertilized near the beginning which could cause the egg to not be released.
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