Idk about white mold,which is usually stringy or fuzzy. But the round beady ones aren't yeast rafts. Not foam or bubbles either. Too rounded like a floating egg yolk. imo,an early stage of infection.
they kind of disappear and come back...also when tilt carboy, they get stuck on carboy side and look just like lil bubbles... but im still unsure lol its my 1st brew