List of X-Men we got so far

Original timeline:

1- Cyclops
2- Storm
3- Wolverine
4- Jean Grey/Phoenix
5- Rogue
6- Beast
7- Angel
8- Nightcrawler
9- Iceman
10- Colossus
11- Shadowcat
12- Emma Silverfox aka Silver Fox

Special appearances: Gambit, Quicksilver, Banshee (or his little son), Siryn, Jubilee, Psylocke (Kwannon), Madrox, Juggernaut, Callisto, Caliban.


Intermedium Timeline:


13- Xavier (not known as "Professor X" yet)
14- Lehnsherr (not known as "Magneto" yet)
15- Mystique
16- Havok
17- Banshee
18- Blink
19- Bishop
20- Sunspot
21- Warpath


Post-DOFP Timeline:

22- Quicksilver
23- Negasonic Teenage Warhead

Special appearances: Archangel, Psylocke (Braddock), Deadpool, X-23(?).

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The X-Men timeline was altered 2 times, not just one (DOFP).
FIRST CLASS was already a "divergence".
Everything is explained here:

THE X-MEN CINEMATIC TIMELINES
http://x-continuity.blogspot.com