Hey mama, totally normal yan! At 15 weeks, kung saan man positioned ang baby mo that week, pwedeng mag-shift pa, especially if ito ang first time mo, maraming space pa siya doon at ang positioning nila changes a lot. One of my mum friends said ganyan din siya, right-sided bump muna, tapos umakyat na later on, haha! But just to be safe and para ma-ease ang mind mo, mention it sa OB mo sa next check-up para makita niya personally at ma-confirm na lahat good with baby.