Never a good time for this to happen. The Bad News is: You'll miss her always(voice of experience). Don't get hung up in anything you hear about the "Stages Of Grief". They are not chronological. You can be in one or a dozen of them in the same instant.
Safety information: You have had a shock. Scientifically, the part of your mother that became you was already in her body when she was born. For her to be "gone" is a *S*H*O*C*K* to your system. Don't spend too much time alone. Let several special friends know to keep their friendship-radar on in your direction and watch out for you(again, voice of experience).
Someone once told me that he used to think his family was rich. Their curtains, sheets, etc. were beautifully hand-embroidered. It was in his late 'teens that he discovered it was his mother's way of dealing with damages and low income -- she mended things with this handwork and kept their home nice with no money. He said he understood when there was a hole in the fabric of his life he must find a way of "embroidery" to keep the "edges of the hole" from raveling and finally destroying the whole fabric. He told me when I was going through the same thing you're dealing with now. It helped me summat.
God Bless you and keep you safe. Your best friends can't do much to alleviate the pain, but hold the tissues (v.o.e.). Keep well.    Tw