Really confused period was 7 days late and only lasted a day and a half

Yisel
Please help has this happened to anyone else? I have a regular cycle 28-29 days. Lmp was 12/22 and it was due 1/19 I ended up being 7 days late with Cramping on and off for the days and nausea. on day 8 started spotting. Day 9 for only have the day it came down heavier. On day 9 the rest of the night I had no more AF but light Cramping on and off. Today I see no AF but still some light Cramping tested this morning BFN what could this be? Help :( DH and I TTC Baby #1 for about a year now.