Minor lower back pain and leg pain?

Manda

FTM here. This afternoon I've been having some minor pain in my lower back but geez do my legs hurt! I did go out and walk around Target and another store today. Wondering if I'm just worn out or if this might be something else. I haven't dropped yet and am 37+5. I have had several Braxton Hicks throughout the day, three, two in the morning about 10 minutes apart and one this evening. Baby has been moving as usual.

Anyone have similar experiences? Should I be taking this seriously or just relax?