Spotting ?!?

Jennie
On Saturday I was bent over in pain with really bad stomach cramps, never had cramps like that before. On Sunday me and my partner baby danced and after it I got a light spot of pink blood so I went toilet and nothing then later that day, I got brown spotting but it went, yesterday didn't get anything and today woke up with more brown spotting taken a test one week and it came back BFN just so confused need advice ?