Need some answers please!

Hi! So I’m now 8 days late and tested once when I was 4 days late and then again yesterday and both test were negative... the first one was mid afternoon when I took it and the second was right when I woke up. Me and my SO have been trying to get pregnant the past few months so being late was super exciting. I’ve had some mild nausea and been super emotional but no cramps. I can’t decide if I should go get a blood test done once I’m 2 weeks late or what I should do.

Has anyone been pregnant before and kept getting negative test but ended up being pregnant?

Thanks in advance!