May I know does hormone imbalance can affect positive pregnantcy test?

My period never come after 1 month (since I've stop having pregnancy control pills)

So I decided to buy 2 diff pregnancy test (HCG urine pregnancy & Clearblue)
I've tested 1st time after my lunch time but it shows negative. The 2nd test (clearblue), I tested in the next day of my first urine but it show positive with pregnant 4-5weeks.