Period late! First month TTC

Steph • Fri, Dec 05

Hey girls! So it's my first month off the pill. Going off the start of my last pill period AF was due 1st December but glow says 4th of December but still nothing. Done a test and says negative :( super disappointment. Does anyone have experience with being pregnant and getting negative hpt? When sould I go get bloods done to find out? Thanks in advance :)