I had unprotected sex just before my period and...

Is there an evidence of pregnancy in your case ?
No , It's noe expected that you're pregnant as you have you sexual activity days before period and getting pregnant usually happens in the mid of our cycle (ovulation days)
What are the tests to be done ?
To exclude being pregnant you have to do BHCG-pregnancy test , which will show accuratly if you are pregnant 
What are the signs of pregnancy ?
absence of period 
nausea 
vomitting 
changes in appetite 
mood swings
vaginal discharge 
 Advice ?
do the previously mentioned pregnancy test