Feeling guilty...still not sure

Caitlin • Married to my college sweetheart, loving life in NYC with our puppies!! Pregnant with baby #1 after 3 years of trying and over 1.5 years of treatments!!
Okay so my predicted Af day is today, but since Tuesday/Wednesday of last week I had been spotting and it was mostly brownish/pink so at first I thought late implantation...then on Friday and Saturday it got heavier with a lot of cm and it was more reddish...I had taken a test on Wednesday that was negative and I took one on sat morning that was also definitely negative. So I figured on Saturday I was out and Af was starting  and my Bff was having her birthday party that night, so I decided to take part in a few bday drinks...come Sunday morning and all I had was spotting and now Af due date and nothing at all just watery cm!! Not sure what is going on yet have to get more tests now but def not out out yet and feeling really guilty about drinking...I know it was probably break through bleeding and Af will start up in a day or 2 but with no cramping or other symptoms I'm feeling so nervous!!