9 weeks preggy - Masakit Balakang

Hello mommies, normal lang ba na sumakit yung lower part ng back ko bandang taas na ng pwet this 9 weeks pregnancy ko? Already consulted sa OB ko and sabi niya possible reason is yung nalalamigan masyado likod ko dahil nga sa AC sa office na parang pang hotdog at maghapon nakaupo since back office work ko at 8hrs halos nakaupo sa office chair, she suggested mag take lang ako paracetamol as an alternative for painkillers so I did, pero meron pa rin ako pain nafefeel til now. Last check up ko is nitong Saturday lang June pa next check up ko, so need advice from you po. Thank you.