Idk what this is tmi … pic

So, I just passed this and another about the same size but more purple and flesh toned, that I didn’t get a pic of. I recently started a birth control pill like 3 weeks ago and I have been using 2 forms of protection since becoming sexually active so the chance of being pregnant is super low. I’m wondering if this is normal, I’ve never seen anything like it before, idk if it could be like an early miscarriage(4wks ago was the first time I ever had sex) or something, or if it’s just a part of a uterine lining. I usually pass clots during my cycle but they’re always just dark and don’t have the light purple/ flesh toned appearance... I don’t have anyone I can talk to irl about this but I’m really stressed and anxious now. I looked at it and I instantly felt nauseous, it also hurt to pass. I’m not sure what this is. I had my period last wk. I see my doctor next week but until then I can’t do much. I actually want to puke rn, my anxiety is so bad.