Could I have popped a stitch after vomiting?

Scratching during emesis could cause failure of the suture. It's unlikely but something that you should report to your surgeon.

Thank you for your question and I am sorry to hear about your illness.  Being so recently out from surgery, it is possible to have broken a stitch, either in your muscle repair or along the skin closure incision of your tummy tuck, or more rarely along your breast incision.  I would speak to your surgeon about what took place, especially if the physical appearance to your stomach has somehow changed.  Your surgeon is in the best position to advise you about any surgical compromise that took place.  

Thanks for your inquiry.  It is best you be examined by your surgeon.  At three days, anything is possible.  If you were wearing your binder thats hould have helped prevent tearing, but hard to know without an exam, good luck.