Ectopic or low hcg???

Renita

So i have been breastfeeding my daughter since she was born she is almost 2 now and is still breastfeeding,...ive finally had my first period since giving birth November 18th and it came on December 18th thinking okay regular...here it is Jan 22 and im 4 dayz late! <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Pregnancy App</a> sayz i should be 5 weeks pregnant but yet still Negative test why is it so???? Testing too early?? Not enough hcg?? I already have 5 daughters i really want this to be a pregnancy scare cuz i want my boy!