Hi. Can anyone advise if they think my zebra loach is pregnant ? I understand it is quite rare. Thanks picture attached.

First that's not a zebra loach it's a yoyo loach and loaches don't get pregnant, they are egg layers. It could be female and egg laden, but there's little to no chance of them spawning. It looks too young in any case so as yoyos are especially greedy the chances are it's just a fattie :)