Hi i got my sutures out today for a knee laceration and it opened up slightly but not much is that normal or should i be concerned?

See your PCP/Plastic: Usually 2-3 weeks is adequate for skin sutures but wounds over joints can open up and may form stretched or raised scars. Scar management is generally a good step to take and your pcp/plastic surgeon can provide guidance.

Likely ok: Try not to bend the knee if that opens the wound. Also pick up some steristrips and use those to cover the incision unless it looks infected.