White Discharge, Brown Stringy Discharge, Abdominal Cramps, Gas, Bigger Breasts. Pregnant?
Thanks for the query.
According to your history the possibility of pregnancy is less as you had negative urine and blood tests and ultrasound also didn't show any findings of pregnancy.
The possible causes for your delayed periods are:
Menstrual cycle can undergo changes depending on the fluctuations of hormones.
There are many factors which can affect the hormones.
Among them the factors applicable to you are recent illness, usage of antibiotics, weight changes etc.
So possibly the symptoms you are having could be premenstrual symptoms.
Wait for one more week possibly by that time you will get periods, if not you can go for tablets to induce withdrawal bleeding with your doctor's advice.
Hope I have answered your query. I will be available to answer your follow up queries. If you are satisfied with all my answer, please rate the answer after closing the discussion.
Take care.