Use first morning urine
and follow the instructions carefully. It would be better to get a blood test for HCG.
irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception
all the time. You may consider implanted contraceptive or an IUD.
Consult this site for more information on this topic.
Practice safe sex.
Get HPV vaccine