Just watched my 13 week ultrasound video again! Oh man so sweet! But now I've notice I've been in…

Just watched my 13 week ultrasound video again! Oh man so sweet! But now I've notice I've been in this tub for so long...... When I move I can feel the water is much colder than when I first got in.... Do I get out or just refill the tub?! (Psst we pay a flat monthly rate for water so it would run up the bill if I refilled my tub) hmmm decisions decisions!!!