Задержка, положительный тест, но отрицательные позже: что думать? Симптомы беременности и поликистоз

So I was supposed to start my period on the 17th I tested two days ago and got a positive test with a faint line, but now when I test I get a negative except today I got another faint line on a 97 cent one. I’m experiencing every pregnancy symptom nausea, sore nips, breakouts, fatigue, bloating, constipation, mood swings, body aches. What should I do or what should I believe? I’ve been trying for so long now to have a baby but with me having PCOS it’s so hard. #myfirstpost