I Regret What I Did And Very Confused

The week before Christmas I had to attend a business meeting in an out of state location.
I’ve been married for 14 years never ever considering being unfaithful.
The evening before the meeting for dinner I met up with an associate from another office who was also there for the meeting the next day. I hardly ever drink but at dinner we shared a bottle of wine leaving me very tipsy.
During dinner I got the feeling he was flirting with me which was flattering since he’s in his mid 20’s several years younger than me.
Our rooms were on the same floor of the hotel so when we got to my door I stopped to tell him good evening then he bent over kissing me on the cheek. The wine had me relaxed just enough that I returned his kiss.
I opened then door to my room and he followed me in.
I reminded him I was married and wasn’t interested in anything but he gently pulled me towards him kissing me on the mouth.
The next thing I knew we were on the bed kissing but I had no intentions of going any farther.
When he started to run his hand up my leg I said no we can’t do that but he quickly found what he was after at the same time rolling over between my legs. I kept telling him we needed to stop .
I had no idea he had been able to get himself out until he pulled his fingers out then put it in me.
I let him know I could get pregnant because I wasn’t on birth control then just enjoyed some incredible sex with him.
I now regret letting it happen because I am pregnant but can’t be 100 percent sure by who. The odds are in his favor since my husband always uses a condom.
I could confess but it would destroy my marriage.