last had sex april 20th. had spotty then extremely spotty light four day period two days early in may 7th. in june period didn't come. week later on 15th june took a test ept 25 miu came back neg. Took same test again on the 17th same neg response. Took clear blue easy 25 miu test twice one on the 20th another on the 21 both neg. She has had a baby previously and showed all the signs of pregnancy by this time last pregnancy. Yet this time she has not one sign of pregnancy. Im concerned because both she and I are not ready for a child and wish to not be pregnant right now. Some other info. She switched birth control brands (same design different brand) in mid april. She forgot to take a weeks worth of pills two weeks ago but we are not worried about that due to us last having sex april 20th. She has been under a ton of stress due to finals and her mother. The last time she missed a period was when she was last pregnant. She is telling me she's not pregnant that she would know. Any ideas She said she's pretty sure it was a period just extremely light guys she missed a weeks worth. Even if it was a missed period in may all pregnancy test would have picked it by now correct? That's a very very long time.