WARNING GRAPHIC PICTURE (I need help figuring what this may be)

I had just gotten off of birth control thanksgiving day not planning to have sex with my significant other we did twice that day and twice two days later on Sunday. That week I started feeling nauseous, stomach cramps, light spotting, lower back pain, along with light headaches and dizziness especially in car rides if I’m not driving(which NEVER happens). And that’s two weeks ago but THIS came out of my vagina??? Im cramping pretty bad as of right now.

I’m really scared as to what it is and don’t want to even think about what it might be. But can someone help me out please :(