Hi i'm 20 years old & my periods are always normal and i had my last period on Jan. 14 and it lasted until Jan. 19 of 2014 but for some reason i skipped Feb & March. I was starting to think i was pregnant because my breast are very tender & get sore i feel sick and sometimes throw up but then all of a sudden on March 31st of 2014 i started bleeding out of no where it started off as a very bright red color then when i woke up this morning it became a very dark color almost black so it goes between a bright color to a dark color What could this be??

Did you take any pregnancy tests at all during this stretch? Was there anything else unusual going on? Illness? Stressful situations?

We can speculate on what happened but we can't say for sure. If I had to guess I would say that you were pregnant and are having a miscarriage. The best thing to do is to talk to a doctor for definite answers, but I am not sure you'd be able to get anything concrete.

As well you did display the one true symptom of pregnancy, several missed periods in a row. The rest aren't indicative of pregnancy and could have just been a sign of a coming period.

I did take a pregnancy test a few days after I had missed my 1st period but it came back negative but also with my 1St pregnancy all pregnancy test came back negative so then I went to hospital & they drew blood & that was how I found out I pregnant... But like I had said in my question when I started bleeding all of a sudden it was after intercourse & I've never had this happen before so what could it be?

It could be timing or any number of things but your physician or Gyno is the ones who can find your answers for you.

Either take another pregnancy test yourself, or see your doctor for one. Bleeding after intercourse can occur in pregnancy, although usually it is more spotting or just light bleeding. It could be that you simply have had off cycles.