That's always gonna be a judgment call, man. If it was me, and I'd already got 3 good weeks in, I'd bang out at least one more (if not both, if that's what you'd had planned) and keep making gains on your upper body. If you're really feeling strong from it and feeling the gains, then I'd go for it. If not so much, then you could always jump into PCT, but I'm a fan of sticking to the plans you'd already laid out for yourself barring some ridiculous catastrophe. Not being able to lift legs is nothing to turn one's nose up at, but you can still make some great gains.