Bubbles in pumped milk?!? Should I Dump it?!?

I’m exclusively BF my 3 month old and have only pumped about once a day for 1.5 months. This is usually in the middle of the night or very early morning with him on the other side in very dim light... But I have never seen bubbles! However, this morning, when pumping my engorged breast (letting down fast) it was bubbling away- but then stopped. I’m freaking out thinking it was poorly rinsed, but looking it up -some people say it’s normal?!? My hubby almost never washes the parts and bottles, but did this time. Should I dump it? Is there a way to tell if it’s soap or is it normal? Help!!! Ugh!