Baby throwing up after feed

Hi - my daughter is throwing up in small amounts for the last 2 days after feeding (not all feeds). This happens even after we've burped her at least 2-4 times after feeding. She just turned 3 weeks old today and consumes on average 2.5-3.5 ounces each feed. I don't think she is gassy or has colic as she seldom cries. This may have to do more with her digestive tract which is maturing. It's not a projectile vomit but more of milk coming out from the sides of her mouth well after 45 minutes to an hour after feeding. Any experiences/suggestions once could share? We have written to her pediatrician but would like to get some feedback here in the interim. Many thanks.