How accurate is pregnancy test?

Almost 3 months delayed 3 times nag pregnancy test all results are positive Frequent urinating Vomiting every morning Swelling of boobs and I felt that my boobs is heavy Sensitive when it comes to smell Fatigue Headache Lower back pain Abdominal pain Craving food especially Manga and lansones BUT STILL I'M NOT CONVINCED THAT I'M PREGNANT. ? WEIRD HAHA BAKIT AKO GANITO? maybe because I'm just a first timer. Momshies sa mga sign na yan buntis na po ba ako?