How long does birth control take effect for a pill for a day?
I know sperm last up to 3 to 5 days in a females body
While it still swimming inside of her can she still get pregnant before she take her morning birth control pill
And what happens if your areolas changes colors to like an light tanish color?

Yes, sperm live up to five days inside the woman's body, and there is a good reason for that, more chance of becoming pregnant, but I think the because pill takes care of that possibility.

Don't base your decision on color change in the areolas.