Hi. Okay so right after I was having sex with my boyfriend I started to bleed, but than I was getting cramps that same day, so i was assuming it was the start of my period. I am supposed to get it anytime between the 14th-19th this month, but instead I got it on the 4th (thats when we had sex/when the bleeding started). Also, the blood was A LOT lighter than normal and my period is usually pretty heavy (the blood is darker and thicker). Is this normal?