Usually very regular. last period spotted for 3 days and 2 weeks later i have like brown pink and clear tissue and spotting lots of cramping?

Possible miscarriage: Spotting between periods is not unusual but lots of cramping with "tissue" suggests the possibility of a very early spontaneous miscarriage. Perhaps 40% of all pregnancies end in spontaneous abortion, often before the women knows she is even pregnant. If your period does not come on as expected to a HPT and if negative repeat in a week to be on the safe side. See http://bit.ly/1VRnmEW