Doctors visit

So finally got the much awaited bfp. Super excited just told my hubby. But now a little worried and paranoid too. I am around 4 weeks 5 days to 5 weeks and traveling and on a holiday. As of now just taken the hpt. How long can I wait or the latest period  before I need to go to the doc. Trying to figure out what to do. Go to a local doc for just a blood test or down thing any suggestions girls