Driving myself mad thinking please help??

So i had a 3 day bleed not like my normal period at all im normaly on 6/7 days and bleed quiet heavy also get alot of belly pain! Now for the past week my breast are swollen and really tender to touch lower back pain weeing more not to mention how tierd i am i cannot be botherd one bit i could just sleep! I went to the toilet earlier today and when i wiped there was a brownish colour on the toilet paper!:/ so i went and bought a test wich came back neg??? What do i do now! When i was preg with my 1st child i was already 6 weeks so came back as positive straight away been trying for 2nd for 5 months what do u guys think thankyou x