Her last period date was July 20, 2013. It was August 05 when we had oral sex. I took good care of our private parts that they never came close (obviously to avoid pregnancy).

She should expect her period by 15th-18th of August by the way but she missed that (She is 19 and her period cycle is still not fixed... sometimes she get it on time.. sometimes 5 to 15 days late)

Now on September 04, I was carrying with me 2 home pregnancy test kits of different companies. With first one we checked in the morning (but that wasn't her first urine carried since night). It came out negative. Only one line was appearing. We were assured that she is not pregnant.

Now since I had another kit we tested again to make it sure. We checked from another machine at evening, around 4 'O' clocks. It again comes out negative. She wasn't pregnant.

Today is September 14 and she has still not got her periods. It has been more than 1.5 months now.

Her daily routine is same. She is not feeling any kind of changes in her body. Everything is same.

I'm so scared if she is pregnant? Can pregnancy test show wrong results? Why is she not getting periods?? What should I do now??

She cannot get pregnant from oral sex.

There is no chance to be pregnant from oral sex.

If you had regular SEX, then she could be, but you are not testing properly, so you are wasting the test kits.

TEST with first urine in the morning as soon as she wakes up.