Breastfeeding, no period yet- any advice on when to take a pregnancy test?

I'm trying to figure out when would be a good time to take a pregnancy test based on the time period from which I had unprotected sex..I'm breastfeeding and haven't had my period yet, so I can't decide based on that. Any advice? Thanks in advance.|||14 days after sex is usually the time when you would get accurate results.