First trimester back pain?

Brittany • I'm 24 and have a 2 yr old daughter. my boyfriend and I had been ttc for 7months then I got my BFP. I hope the rest of you also get your BFPs soon
I didn't get this during my first pregnancy til 30wks. I'm only 9wks now...why? It concerns me...I hope it's just a UTI.