Um... If ur on ur period, ur not pregnant.
This is not a diagnostic site for illness, disease or injury. Go see a medical practitioner.
Its very possible you could be pregnant. Unfortunately I cannot tell you if you're pregnant. Only a blood test can do that.
If you are pregnant, the period you miss you won't get at all. The abdominal tightness is probably just cramping from your period coming late.
Go see a doctor ASAP.
I have experienced tightness and cramping after sex. later in pregnancy, sex can bring on labor. early in pregnancy, your probably feeling your muscles contracting after orgasm because it affects your uterus as well. like braxton hicks contractions
There are so many causes of abdominal and back pains it is impossible to say. You need to see a doctor. If you have not yet missed a period, that may be why the test is negative.
you need to fart!
The bleeding will last a few days or more, if you mean by "show" the bulge in your lower abdomen/pelvis, it depends on how far along you were and how much weight you have gained and if you have been pregnant before.
The spotting is always cause for concern. Get in to see the doctor any time you have spotting while you're pregnant. Pain in the lower abdomen can be serious but it can also be pulling ligaments. Again, see your doctor if you have any questions.
The brown line that some pregnant women get down the middle of the lower abdomen is called the linea nigra.
lower abdomen