Life can take unexpected turns at any time and you've clearly had an unfortunate and busy couple of months. What is it they say about progress? Even if its slow, it's still progress!
If you can do 7, the 13 will be fine, just use a running app and let it count down the miles for you for the last few. Like the 1p's make the pounds, the 1m's make the half marathons! Lol x