Hot tub 3 weeks post BA, would I get an infection?

Different microorganisms are responsible for different infections, and they can develop at different rates. Keep an eye on your incisions in the meantime, and be sure you’re honest with your surgeon during your follow-up appointments. If you notice redness, tenderness, oozing, or other symptoms at your incision sites, contact your surgeon right away. 
If incisions have healed and no scabs are visible then your chance of infection are very, very low.  I recommend 2 to 3 weeks of no hot tubs if no healing issues with my patients, so you are right in that window.

Well let's hope for the best.  Try not to worry so much until you have to.  Hopefully, your incisions are closed and no infection will occur.  Maintain open communication between you and your plastic surgeon. At this point you will want to keep an eye out for any fever or redness along the incisions. If this happens then contact your surgeon.Best of luck to you !

Thank you for your question. We do recommend 6 weeks. If you don't have an open areas you should be okay. However, please follow up with your plastic surgeon for regular in-person assessments.