Period 2 weeks early

My last period was 8/29 which usually last for 3 days. In the morning of 9/21 I wipe and there was pinkish blood then about an hour later it became darkish brown as the day went by became bright red and is flowing like a normal period. My s/o and I been TTC for our first child for 4 months now. We have sex on the 2 days before ovulation and also on ovulation day and the day after ovulation. 3 dpo I'm here having what I think is my period since it is normal and isn't spotting I figure it isn't implantation bleeding... I have cramps like a normal period and off and on pain in my right side no sore boobs.

Can anyone help and I've never had my period this early