Hi justpeachy, I was also a triple negative breast cancer patient. Finished all treatments, surgery, chemo. and radio. in April last year, 2013. I did 6 rounds of chemo. and 30 sessions of radio. I would imagine your chemo. being a triple negative, you will first have the FEC chemo 3 rounds approx. and also maybe another 3 rounds of Docetaxel. Your circumstance may be a little different, quite a few of the TNBC patients have those drugs and yes most likely you will lose your hair. So Be Prepared. Get a wig, scarves, whatever head gear you like, and wear them all proudly. You will have lots of different side effects from both drugs, you will be told by your chemo. nurse, what to expect. Don't be too horrified you will get through it all. I know it is all new to you right now, and probably feeling a bit overwhelmed by what has just happened in your life, but you will be strong and get through it all. And you will find you come out of it even stronger. It is all an emotional time, that is normal, let the tears flow, don't be afraid to cry. There is light at the end of the tunnel.
My hair started coming back about a month or so after my last chemo. but now i love my short hair. It used to be shoulder length. I am older than you by 20 years but when your hair does come back enjoy having the short hair, you might like it, easier to manage.
Good luck with all your treatments and keep reading posts on this site as you will find a lot of support on it. It is like a daily diary.
Take care
Debbie x