Excellent news. That's 7.8 miles more than you rode yesterday. You remind me of my three-month hiatus after surgery a few years ago, and indeed how good it felt to be back on the first time. Definitely take your time building back up, esp. if you still feel tight. But I'll bet the best thing to loosen up that tightness is to ride regularly, even if it's short rides.
Today's good news? Idunno, it's a little sunnier today than it's been all week, and we'll be able to put a few miles on the MUP, and do our Trader Joe's shopping by bike. Oh, and we enjoyed some C&V bike porn at the farmer's market, a '90s Bridgestone MB-something and an '80s Trek 820 Antelope with a 5-speed Sturmey. Both sporting studs and other typical winter kit.