Back pain normal?

Cayt

5 weeks 6 days. I have periods of nausea throughout the day, mainly after waking up and before bed. My breast and nipples are very sore and sensitive. But my main complaint is EXCRUCIATING lower back pain. I have a very high pain tolerance and rarely get upset over pain. However for the past 3.5 weeks I’ve lost sleep due to the pain. It’s progressively gotten to the point where I can’t bend down, struggle to roll over in bed and often times just lay awake in pain all night to the point of tears. I saw my doctor Monday who blamed my growing uterus. But I haven’t seen anyone else with this symptom so early on. I feel like it has to be something else? Any insight ladies? Thanks in advance