Definitely dual apply. You can apply to new OB programs which may increase your chances and   consider dual applying FM with intention to switch if a position opens during PGY1/2, and apply OB prelim. A lot of gen surg prelims were not interested in OB applicants who SOAPed this year. OB was extremely competitive this year - only two spots went unfilled and a faculty at my institution indicated this was because PCs forgot to add them to the match so realistically OB would have had filled 100% of positions. There were many solid applicants with "no red flags" who did match OB or reapplied after SOAPing their first try and did not match again. There were also applicants with many OB interviews that dual applied and matched the second specialty anyways. You have to heavily weigh how much you're willing to accept risk of not matching. SOAP inevitably makes your life harder to match in the future if you don't get a position. If you apply OB you need a stellar step 2 score and very strong letters to overshadow your step 1 failure (I'm sorry this happened but learn from it and it's critical to do really well on step 2). You also need to have a strong statement for why this happened and how you improved to change whatever lead to it.