I have all the pregnancy symptoms & have done 2 tests both coming back negative why is this when i have sore/swollen breasts and morning sickness etc?

Depends on timing: If you performed the 2 pregnancy tests BEFORE you actually missed your first period after having relations or after ovulation then, the tests would likely be negative. You should wait until you miss your period. Symptoms of being pregnant can be symptoms of a thousand other problems as well. If you've definitely missed your period and you are REGULAR then, you may wish to see your OB/GYN doc.