My boyfriend and I had sex last August 21, I had my last period last August 7-10, 2012. My period was delayed last September for 12 days. That's why I took home pregnancy test and the result was negative. My period lasted for four days and I am pretty sure it was not just spotting though it was not as heavy as my past periods, I do change my pad every now and then. Come late September I suddenly felt the feeling of being pregnant. I felt that my stomach was getting big and I had diarrhea, stomach aches and crampings for two weeks , I was really stressed and anxious that's why I tested again last October 2, I got a negative result. I experienced stain in my underwear before I tested the pregnancy test. Weeks after I was still afraid of being pregnant because my period is due last October 10 and now it's already ocrober 16,that's why I tested again for the third time, again the result was negative. Am I just being paranoid? Can someone help me with it? Thanks!

Tests should be accurate at 55-56 days, but some women don't test positive with HPTs and need to get a blood test. But you might not be pregnant at all. Stress might be delaying your periods and bloating you. Menstrual cycles can mimic pregnancy. There's just no way to say online, and there are no probabilities that can be given, sorry.

Are you using the first urine of the morning as soon as you get up for best results.

Can you be, yes of course

Could you due to hormone changes going to have new dates for period, and just be a little latter or longer between, maybe

Could you have a infection or STD that is causing missed periods. yes

Could excessive stress be causing missed period, yes

At this point, if there has been no other sex, go to your doctor for a blood test , or to local women's clinic

Our sexual intercourse last August marks our first and last contact. Yes I had my first morning urine for my pregnancy test, and yet I am still paranoid of being pregnant. Should my three negative result put my mind into rest? Thanks!

Since the moment I got paranoid, I can't sleep the whole night thinking that I was pregnant. I really felt that my stomach is enlarged and felt palpitations more often everywhere in my body. My heart rate increased a lot. But I kept on getting negative results for my Pregnancy test. What should I do, I don't want to get pregnant at this point

You aren't quite getting the fact that no one online can tell you that you are pregnant or not. Odds are that you are not, but if you are in the small % group that is, then you are 100% pregnant.
Again, worry can cause this and you have nothing wrong at all. You may have some other endocrine (hormone) problem. You may be hitting early menopause. You may be severely anemic. You may have something totally unrelated to reproduction. NO ONE knows online. See a doctor since you are so stressed.