Pregnant or Pill side effect?

I got off the pill a month ago after being on it for 4 months (3 months Diane 35 then switched to Althea for the 4th month - last pack) I had my last withdrawal bleeding on the 4th day of pill free week from the 4th and last pack. Boobs got really sore after 3 weeks, and it got worse until it finally hurt less + minimal to no discharge now. Currently on my 31st cycle since the last withdrawal bleed last November 11 (first day of withdrawal bleed from the last pack) but no real period still this December.

P.S. Had protected sex (condoms) with bf 2 days after the last day of withdrawal bleed last month.

Could it be that I’m pregnant or hormonal fluctuation? Did anyone experience the same thing?