I have a 2000 reg, 145k miler A4 TDi Avant, commonly referred to as the work-horse!

I had a small leak in the radiator, which was amended with decent sealant a couple of weeks ago. Given its minus 14 here, and I've been topping up during the summer with water (not much, probably a little over a 3rd of a litre), in a panic I've topped up with Blue Antifreeze/Coolant. The stuff already in the car was Pink.

Should I panic an drain it now? or wait until spring? Do I even need to drain it? all i did was top it up