Why Is The Color Of Blood Not Red?

I'm taking a birth control called Jolessa, it's like Seasonique, so I only have my period every three months, and this is my first period. But, I'm not having red blood, and also, when I wear a pad, no blood actually leaks out, but when I wear a tampon, theres blood. But this comes and goes, has been for like a week now. I feel like something has shifted down there, when I put a tampon in, it feels like something has shifted down, making it harder to get it in. and painful But the one time I had sex, I was told that it somehow felt wider?