Why are my periods delayed after negative pregnancy tests?

The 17th starting and the 20th ending period is a pretty normal cycle. Having unprotected sex on the 22nd might expose you to the risk of getting pregnant. So, watch for possible symptoms like nausea, fatigue, and breast tenderness. If you're concerned, think about using emergency contraception or taking a pregnancy test. 

Pimples in this area can happen to any of us due to sweat, poor hygiene, or ingrown hair. You can use a warm compress on it a few times a day. Moreover, donning some loose cotton panties is yet another thing that can assist one avoid irritation. If it does not vanish or becomes worse, you should avoid touching it. It will only make things worse. Prompt medical attention should be given if it does not heal.

Fatigue and vomiting may indicate pregnancy if your period is missed. But these signs may also be associated with other medical illnesses. It would be advisable to consult with a gynecologist

The normal cycle sometimes is longer or shorter than usual. But if your cycle goes on longer than 10 days or if you have severe bleeding, you should see a doctor. You should see your gynecologist for a proper diagnosis and treatment of your condition.
 

It is scientifically possible to have short phases during the first months of pregnancy. But it is vital to seek consultation from a gynecologist and do a pregnancy test to ensure that you are indeed pregnant. I suggest that one should contact gynecologist who deals with obstetrics and gynecology for this purpose.