Late period

I had a very passionate night of unprotected sex on Nov.22 2017 with the boyfriend of 3 years. I came on what I’m thinking was my period on December the 9th 2017 and it ended on the 13th Of the same month ( 4 days ) which my period usually lasts 7 days . on day 1 of my cycle ( Jan. 7 2018 ) being late I woke up to my boobs leaking milk, keep in mind that I just had a baby 7 months ago ( May 31 2017 ) and I’ve never breastfed. It’s now day 3 of no cycle. Any incite on which direction my thoughts should be going ???