Oo, normal yan sa pregnancy, lalo na pag lumalaki na ang baby at bumibigat ka na, ang pressure sa joints at ligaments namin talaga ay nagdudulot ng ganyang sakit! A few of us moms had the same thing around that same weeks, parang arthritis or malamig na pakiramdam talaga. Pero since it's your left side lang at hindi sobrang severe, most likely yan lang ang pregnancy-related pain, pero mas okay kung i-check mo pa rin with your OB para ma-rule out kung may ibang cause, especially to make sure walang circulation issues or anything else going on. Try warm compress, stretching, at comfortable shoes muna, pero definitely mention it sa next check-up mo para mapacalmasan mo ang isip.