Hello, Early test may give negative result. I suggest to undergo one blood test for beta-hCG for confirmation. Besides pregnancy, there are several reasons of missed period like Poly Cystic Ovary (PCOD), hormonal imbalance, over weight/ extreme loss, mental stress, emotional upset etc. Therefore, I suggest to undergo one USG lower abdomen and hormone test in the absence of pregnancy. You may require progesterone pill to induce period. Kindly, consult with your gynecologist for proper guidance. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well and practice safe sex in future.