lower back pain normal? 9 weeks

Alex
Hey ladies! I'm 9 weeks 2 days and today I've had horrible lower back pain! It's just like a dull achy pain and I've had it alllll day. Haven't had it any other time during my pregnancy so far. Is this totally normal around this time or am I just over reacting? I have my first ultrasound on Friday and my anxiety is driving me crazy