Being frustrated and need advice

I have a total for children my last child that I had it took me a long time to become pregnant with my daughter. The first three pregnancies I had no period I knew that I was with my fourth child I had a period in March 2008 and did not know that I was pregnant until May because I started having symptoms in the month of April and thought that it was PMS symptoms which I did not start at all and I had a healthy baby girl in December 2008 my has been and I've been trying to get pregnant and when I did and I had two miscarriages my periods became irregular not too sure when I start or ovulate. In the month of July I had my period was cramping and extremely heavy in the month of August I had another cycle which was light to medium with no cramping I have been ovulating last week and my husband and I've been trying during that week After I had my period in the month of August I've been extremely loaded went to the doctors they tell me there's nothing wrong with me they did not take a pregnancy test because I start my period in the middle of August and now I feel like I am repeating what I did with my daughter.

I'm afraid to take a pregnancy test and it becomes negative I'm supposed to start around 14 September and my question is should I take a pregnancy test now or wait until after the 14th. His symptoms that I've been having extremely bloated and a weird taste in my month I am his eyebrows my teeth every day lease three times a day lol.

I believe that I'm just afraid that I have another disappointed month of a negative pregnancy test. What should I do? Have a wonderful day