lifted with my back when helping my mum

she has a 200kg king mattress that i had to help lift. by the end, my back overcompensated for my legs and my lower back felt very sore.

what are some stretches or care i should do just to prevent injury, pain or having to see a doc.

it doesnt feel too serious (like its not hurting as i type and it was 5 mins ago) but i might put some ice on it just cause