Feel pregnant but test says negative

Hey everyone I have PCOS and the past couple weeks I’ve been having early pregnancy symptoms so I took two test a week and a half ago and a couple days later both said negative. My last period started on October 31 so idk how long I should wait for Hcg levels to show on a home pregnancy test? Symptoms I had: lower mid back pain, cramping, nausea, vomiting, food cravings, fatigue and today I experience lightheaded-ness