Probiotics

RDH+1
I have had my baby on probiotics for about 6 weeks now. 
Her gas has always been bad and I thought it was better on the probiotics (we've changed formulas, etc, so it could have been anything that helped). The last few nights I'd forgotten to give her the probiotics and then remembered again last night. I noticed her gas was better on the days I forgot but then worse when she had the probiotics. Today has been a very smelly day! 
Anyone else notice that or do you swear by them?