I was fingered, been having a brown discharge and bloated abdomen

My boyfriend and I were fooling around 3 days back, I was wearing my underwear while sitting on his lap, and he was wearing his 3/4 jeans.
I knew my vagina and his penis were in contact, is it possible for me to be pregnant?
Afterwards, he fingered me for the first time. He fingered me for about 3 minutes or so.
And when I reached home, I had brown discharges on my underwear, and I noticed that my abdomen's bloated and hard.
I was supposed to have my period 2 days ago, after the day he fingered me, but it didn't come.
I've been worried sick, can somebody please help me?
Am I pregnant? Are the brown discharges and bloated abdomens normal when you get fingered for the first time?
Help!