Im 13 days late. i had protected sex before my period starts. i took a pregnancy test last week came out negative. i do have period cramps here and there. i just wanna know why im late. is it because im pregnant or its normal to be late?

Hard to guess: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A home urine pregnancy test gives a accurate result. One can test about 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after missing a period, or 1 week after starting a "weird" period. If worried, can retest after one more week.