period or nah?? confused

J-Snuggles
I had sex Friday..unprotected.. and today I had soft pink bleed it didn't last for long like 30mins. Or less. I was thinking  implantation bleeding but everything says that happened 6 to 12 days after Fertilization.. my periods are irregular I had one on September 19 it lasted 7days before that I had on August 10 it lasted 5 days before that it was July 24 and it last 5 days... before these three weird periods my cycle was normal came around the same time each month and only lasted 3-4days max.. now it's coming closer together and lasting longer.. and today there was soft pink. And I just had sex Friday... so I was wondering what this might be. Since it's to early to be any type of period.