No, but your ears definitely have a break-in period. It takes a while to adjust to the tone of a new instrument or amp. Also, technique has a bit of a break-in period, and it sometimes takes a week or two to slightly adjust hand position, touch, etc. to bring the most out of an instrument that has a different feel or tonality.
Probably helps that I've actually kept and played this bass for longer than 3 weeks.

