Spit up or reflux issue?

Am

Those with children who have reflux- how did you know the difference? My LO is 10 weeks, breastfed, and she’s been spitting up a lot lately, almost after every feed. Sometimes it’s a few hours after a feed. How do I know the difference? I’m also dairy free for a few weeks cause she’s a very gassy baby, so was trying to see if that helped.

Thank you!