How can the President overturn Roe vs. Wade to begin with? Someone is going to have to explain to me how that one would work. The President doesn't have that type of authoritity.
Anyway, with this currently being a non-issue, I wouldn't know how to answer the question outside the auspices of mentioning that emergency contraception can be highly effective in preventing unwanted pregancy, in general.
A progestin-only emergency contraceptive pill, if taken within the first 24 hours after unprotected sex (or rape) can be up to 95% effective.
Some emergency contraception, even if taken within the first 120 hours post sex (or otherwise), is still quite effective.
See this site for my source:
Emergency contraception: Effectiveness of emergency contraceptives
I've always seen abortion as being less of an issue and there being more need for focus on reproductive responsibility and options to better cope with potential of an unwanted pregnancy.
As horrifying as a rape can be, girls and women alike should be educated on the importance of seeking medical help for themselves. Emergency contraception shouldn't be hard to come by and support should be available. It's less convoluted to take a pill than it is to have an abortion. I think it wiser to focus more energy on education than changing such laws.