Dear Mariasilburn, I hope you find your answer in tese few words:
The symptoms you mention are not conclusive, usually symptoms of early pregnancy
are similar to symptoms of delayed menstruation
In order to confirm or exclude pregnancy you should have a blood test
which is much more sensitive and accurate than the home test.
If the test is negative for pregnancy, you may either wait for spontaneous mensruation or induce menses by progesterone
as will be prescribed by your physician.
Finally if you are seeking pregnancy you should search for the cause which is mostly related to the menstrual irregularity you have. This is another topic to be discussed later.
Finally I wish you the best of luck.
Dr. Ahmed Bahaa.