When should I take a pregnancy test if my period still came?

On July 8th, my period came. It was either 4 or 9 days after i had sex. the thing that's worrying me is that my period was considerably shorter and lightened up a lot on the second day. I was on birth control previously and I'm wondering if that is maybe why my period was shorter. Since then, I've been feeling rather off with a little bit of nausea and headaches and a weird taste in my mouth, so I'm worried I am pregnant. But I don't know the right time to take a home pregnancy test because my period did come...? please help thank you
 
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