As other posts have indicated each pregnancy let alone each person seems to be different - with my first I had symptoms before 4 weeks (not that I knew what they were until after) with my third I rushed to the doc at 6 weeks because there was no sign of anything other than a positive POAS. Hopefully given what you have to go to to get your BFP you are one of the lucky ones who gets very few symptoms other than the growing belly or that any that develop only stick around for a short while. Congratulations and best wishes for your pregnancy.