"I have a turtle."
Translation:Jag har en sköldpadda.
Yes, it's correct.
When a "k" is followed by a, o, å or u, it is said as a hard "k" (like in the word katt) but when a "k" is followed by e, i, y, ä, or ö, it becomes a soft "k" and is pronounced like "sh" (as in kyss.) NOTE: With "k"s there are some exceptions
This rule also applies to "g", and "sk". Soft "g" kind of sounds like a "y", and soft "sk" makes a kind of blowing sound.
I find this video to be pretty helpful.
I hope this helps, happy learning :)