Probably not. Though abortion was illegal in the US at that time, any woman or girl with a few hundred dollars (probably less than $500) could have had an abortion done by a real doctor in an office or clinic. Still, it was a risky business for a doctor, even in Nevada; and although Michael was trying to pose as "legitimate," a Dr. would have to be deaf, dumb and blind not to know his reputation. That's why I tend to think it really was a miscarriage, as Tom said, not an abortion.