What do contractions feel like?

M • 💍🐶👶🏽🎀👨‍👩‍👧💕
I'm 36w and all day today I have been getting the worse cramping feelings in my lower abdomin. Feels like period cramps, but  sometimes going around to my back. Baby hasn't really been moving today, but the cramps aren't really getting too bad. 
Are these contractions? I don't know if I should go to L&D or not 😕