probiotics and green poop?

My 15 week old is EBF and we recently started him on probiotics to help him with gas and straining to poop as well as to help get good guy microbes (he was emergency c section and had to have an iv antibiotic because I had a fever and they feared he'd get an infection) anyways, we just started it Friday morning. He had a normal poop Friday (yellow) and then Saturday through yesterday he had light/lime green poop. It's not a foremilk hindmilk thing because his poop was fine until we started them so idk if it's a virus or if he's just adjusting to the probiotics still... Also if he seems to be ok is it a big deal? I messaged his dr and am waiting a reply, just wondered if any of you all have gone through the same thing.