@ShwartzAndCompany I’m a Certified Nurse Midwife/OB-GYN nurse practitioner, so I have lots of professional experience in this area.
I’m guessing you must have missed a period and then had a positive pregnancy test? When did the bleeding start and how has it progressed? The most common scenario is similar to what @casheroo described. It usually starts with some spotting that happens off and on for a few days to a few weeks. When the miscarriage is actually happening, the bleeding escalates and cramping starts. Eventually, the cramping and bleeding get very intense for a little while and then the woman passes tissue – it looks more like uncooked muscle meat maybe with whitish grayish smooth stretchy fibrous membranes. If it just looks like liver, it might only be blood clots and not the actual pregnancy.
If the miscarriage is complete, bleeding and cramping settle down pretty quickly after that. Most women will have their next period about a month later if it was a complete miscarriage. They might spot up until then. After that, things should be back to normal. Most women who are 6 weeks or less are able to safely miscarry on their own. Sometime though, part of the pregnancy stays attached inside the uterus and then medical help is needed. If bleeding or cramping increase at any point after a miscarriage you need medical attention. You have a possibility of developing an infection, or starting to hemorrhage. If you don’t have a normal period within 6 weeks of a miscarriage you also need medical attention, because you may have retained tissue. It’s even possible that you may still have a viable pregnancy rare but I’ve seen it happen with women who were convinced they had had a miscarriage.
You also need medical attention regardless of whether you had a complete miscarriage or not because you need a blood test to see if you’re Rh negative or not – hopefully not, because if you are you should have had a shot of rhogam within 72 hours of the bleeding episode to prevent problems with pregnancies in the future.
I agree with @janbb – Planned Parenthood is a great place to start. When it comes to reproductive services, you’re legally allowed to consent for yourself and they charge on a sliding scale based on your personal income. Please call them ASAP. And once you make it through this crisis, they can help you choose a reliable contraceptive method if you plan to continue being sexually active.
You can contact me via private comments if you want.