LO spits up MORE after Pepcid

We have been giving our LO Pepcid/Famotidine for a few weeks now, twice a day, .2ml, 30-60 min before his bottle. Almost every bottle after Pepcid has more spit up than bottles that did not follow Pepcid!! I am trying to figure out if the Pepcid is causing it, or if it is a huge coincidence. We have a pediatrician appointment this week and plan to bring it up to them!