Oh JoJo, poor thing! Better out than in, as they say .... um, maybe that's not too helpful. 
Sundae Twins don't run in our family at all!! Utter surprise, especially as they were conceived naturally. But I had read that as soon as you come off contraception (maybe just progesterone-only, which I was on, but maybe all, I can't remember) you can be ultra fertile once things get going again. We did joke about this ... or, rather, I joked and DH went 'Hmmm....' Also, there's a higher incidence of twins amongst the over 35s even without the IVF etc factor. I think it's to do with the ovaries' last gasp before the menopause, chucking all the eggs out! So, probably I released two eggs (I was only in, I think, fourth cycle after coming off POP-injection and then pill) and DH's supersperm fertilised them both! Mightily impressed at our aging bodies!