thanks for your query.
firstly you should have yourself evaluated by a gynecologist.
You definitely took the urine pregnancy
test too early, as it would be positive only a few days after you miss a period.
So you should repeat it once you do not have your period for atleast 4 - 5 days over your normal date.
You need to see a gynecologist for your breast complaints, as what you describe sounds like a bruise
or a traumatic fat necrosis
Also the bloating
and cramping could be due to pre menstrual symptoms.
Instead of repeating a pregnancy test at home, please see a gynecologist, so that pregnancy is confirmed, and all your other issues are also evaluated and taken care of.