Lower Back Pain!

Don’t know if this is the right group or wrong group to post this...

I haven’t been lifting or working out since last year November!

My boyfriend recently started working out. He’s about 5’5” and weighs 143lbs.

On the other hand, I am 5’2.5” and weighs 136lbs :(

Anyways, I carried him the other day FOR FUN! Just testing out who is stronger—I am.

Then, about 5 days after, my lower back HURTTTTTTT! We also had sex, too. He had condom on and he did not came inside.

Now I’m freaking out. 🤦🏻‍♀️