Ay mama, upper back pain + hirap huminga at 35 weeks, please check with your OB soon, okay? Hindi siya normal na i-ignore kahit alam nating back pain common sa pregnancy, pero ang breathing difficulty ay kailangan tingnan ng doctor para sure ka lang. A few of my mum friends nag-experience ng back pain from sleeping position or heavy uterus, pero yung combination mo ay better safe than sorry talaga. Pwede ring posture, pillow arrangement, or something else na kailangan i-address ng doctor para comfortable ka at baby mo safe. Don't wait pa, sis, better to check now at 35 weeks na lang. Sending you hugs!