Hi, I had unprotected sex 3 times a month after stopping birth control. Then I had light bleeding for 3 days with spotting at the time of my expected period. During that time, I had protected sex, and so far I am late. My period was due to start on sunday and the only symptoms I have are fatigue, frequent urination, and mood swings. Could the spotting and 3 days of light bleeding be implantation bleeding?