Medical abortion is usually what doctors do especially for <10 weeks. This involves two prescription medications being taken. Some women in countries with heavy anti-abortion laws, and/or they lack healthcare access, may get these pills off the grey market. I’ve read of informal networks of women in the US who try to get these meds to women who need it.

I know this isn’t an US site but it is an official government source from Singapore that informatively explains the details of medical abortion: https://www.singhealth.com.sg/tests-procedures/medical-termination-of-pregnancy

Note: as the site mentions, doctors usually prescribe antibiotics too

Above 10-14 weeks, medical abortion is still possible but runs a significantly higher risk of complications and a higher failure rate (failure with the medical / pill method would necessitate surgical abortion). Which is why women choosing medical abortion for later-term abortions are usually hospitalized and monitored.

So above 10-14 weeks, usually surgical abortion is the method preferred by doctors but there is no DIY version of that https://www.singhealth.com.sg/tests-procedures/surgical-termination-of-pregnancy

https://www.nice.org.uk/guidance/ng140/resources/patient-decision-aid-on-choosing-between-medical-or-surgical-abortion-from-14-weeks-up-to-24-weeks-pdf-6906582254