maybe pregnant?

I had sex three days before my period. No condom, on the sugar pill, and he thinks he pulled all the way out in time. But I'm super nauseous, my nipples are killing me and I'm exhausted. And my period was shorter and lighter then normal. I know the only way to tell is to get a test but I'm unable to do that do to family and work stuff for the next few days. Does anyone have any light to shed on this for me until then?