Hay, ganyan talaga ang feeling sa 33 weeks, ang baba ng baby ay lumalaki na kaya parang nag-shift lahat ng weight mo towards the back, lalo na sa gitna ng lower back area! A few of us moms felt the same thing, at honestly it's super normal sa stage na yan, pero if the pain is getting really intense or hindi mo kaya, better check with your OB para ma-rule out if may tension or something else going on. In the meantime, try warm compress, good posture (mahirap pero try lang), at magpa-prenatal massage if kaya, it really helped me! Hugs, mama, almost there na!