Hello, I have gone through your query and understood the concern. Methylphenidate has been assigned to the category C by the FDA. This means there are no adequate controlled animal studies to detect fetal effects while this drug is used during pregnancy and human statistics are not available. Thus if you have taken the medication once, you can think of continuing the pregnancy. If however, you have also taken the medication to induce a medical abortion, abortion is the only alternative left since fetal anomalies are a possibility with the use of Misoprostol and Mifepristone. Please contact a specialist for further help. Do not self-medicate. Hope this helps.