T.M.i?

Hello glowers i need some advice!! Badly 21 yr old here.. i recently had sex after my fertility cycle my partner ended up coming inside, a large amount.. i did use the bathroom after, but i started spotting today it was a small amount and now its stopped, ive read mid bleeding throw cycles are a sign of ovulation. Should i pick up a pregnancy test if my periods late this mnth? What are your thoughts. I am not ready to have any babies lol