2 days late and scared

Victoria
So, I haven't had sex for about 6-7 months and then the week before last  I did. The condom didn't break and we were very careful. I was meant to get my period 2 days ago but I still haven't got it. I took a pregnancy test and it said it was negative but I'm still nervous about it. 
I've tried to put it down to stress because I had a close friend pass away three days ago but yeah. 
Should I try another test or should I be fine?