Just looking for some advice!

Hi all i am 5 days today late for my period! its always on time and never late apart from when i have fallen pregnant. I did a clear blue test yesterday afternoon but came back negative (should of done first thing but couldn't wait). We have been using condoms as the only form of contraception for years and had no problem, but today i vomited first thing and have pressure downstairs(happening for a few days). Could i be pregnant?? Should i retest or visit my gp??? At this moment in time its all i can think about, its driving me insane!!!