Scare

I don't know why I couldn't see the comments from my last post so I'm posting again:

Alright. My last period ended on April 6th. I slept with my ex on April 8th. I'm very regular with my period every month and it should've started on the 2nd. I did recently start a graveyard shift as well so I don't know if that could play a part in it?

When do you suggest I take a test?