I read this story many years ago but I can't remember the name/author. As far as I know, the story was never completed:
-Kagome and Sesshomaru are complete strangers that end up sharing a cabin for the weekend.
-They end up becoming attracted to each other after a rocky start and make love all that weekend.
-Kagome never gave sesshomaru her real name but her nickname. I think it was Kay.
-Sesshomaru wakes up at the end of the mini vacay and finds Kagome gone with no way of contacting her.
-Kagome is pregnant and has a baby that she is struggling to support while Sesshomaru is unaware.
-He finally finds her when she applies for a job to his company.
-Kagome still kept the baby from Sesshomaru but he finds out where she lives and is appalled at her living conditions when he would've gladly taken care of her and his child.
Please help me find this if you can.

When Two Paths Collide by Barbara-Marie.
Its a one shot with a sequal -> When Two Paths Entwine

You can find it on Fanfiction site - www.fanfiction.net/u/616139/Barbara-Marie

They are both rated M, so not suitable for minors.
Hope this is what you are looking for.

Omg, yes that's it! Thank you so much!

Glad I could help.