<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I am 24 years old. I had sex during my ovulation period. and now my periods are 15 days late... I took pregnancy test 3 times in last 7 days.. but got negative.. I want to conceive... current symptoms of pregnancy I am feeling are lower back pain.. lower abdomen pain.. little sickness... What should I do now??? Also, If we still have sex... would it be beneficial for pregancy?? or should we avoid until my pregancy test comes positive or get periods??  <response>: Hallow Dear, If otherwise you had regular menses in the past and the pregnancy test is negative even 15 days after missed period, you are most probably not pregnant. This delay in the menses could be due to the apprehension for desired pregnancy. If you still want further confirmation, you have two options: ultrasonography andor Beta Chat Doctor test. All the symptoms you are getting are likely to be due to apprehension of pregnancy. At this stage, sex would not be useful for conception. I would advise you to wait patiently for periods to appear. Another alternative is to take Tab. Devilry for 5 days and you will get with Chat Doctor. From day 9 onwards, you may go for ovulation monitoring by Ovulation monitoring kit or Ultrasonography. Try to adjust your marital relations on and around the day of ovulation. This will help you to become pregnant. I hope this helps you. 