My period lasted for 3 days. The bleeding was very light on day 1 and pink. Day two was a bit heavier but nothing like normal. It was dark brown with a bit of bright red. Day three it was very light and pink again. Normally my cycles last about 5-6 days. 4 days after my period stopped, I had light cramping and pink , very light bleeding. It only lasted a couple hrs, then nothing again. That was yesterday. Today I have lower back pain and light cramping but no bleeding. I took a test this morning and it was negative. I am 32 yrs old and have never been pregnant before so I don't know what to look for other than pregnancy symptoms I've found on the net. The only symptom I have that is possibly related is back pain and constipation. Anyone had this happen or have any idea as what could be going on ?