This reply is definitely too late regarding the morning after pill, but I just wanted to say something about the risk. Basing the 'safeness' of sex on some pre-period spotting is too risky if you're not going to use protection. I would only do that if I didn't mind getting pregnant.
As for taking a test after
you've had your period, that's probably not necessary because having your period is usually a very good indicator that you're not pregnant.
I hope you got your period!