Weird clump and blood 6 week pregnant

Vera

Need some advice! I am 6 week pregnant and today when I whent to the bathroom I saw that my underwear was wet and reddish. I put 2 fingers inside my vagina and I saw red, old blood in a jelly like discharde and a huge clump of somethind black. Tomorrow I have an appointment with my doctor but I am freacking out..any opinions??