struggling

since I can remember my period comes on the exact day it is suppose to and last for 5 days. we have been TTC for about 6 months now and this month, what I think is my period has come two days early and only lasted two days, I only had to use about three tampons and woke up this morning with a clean one. Could it have been implantion bleeding? I took a test about 10 and 11 dpo and got bfn and 12 dpo is when I got the bleeding, I have been very bloated, hungry and have sore and swollen feet after work, help please