Is it safe to get a keloid injected w/ Kenalog-40 one week before I am going to try to conceive?

The scar is small- just 1 sq cm, but I find that a large dose is the best way to flatten keloids permanently (the more they initially depress, the less visible they are once the tissue returns to normal). It is on the side of my stomach and I really want to get it injected before pregnancy stretches it out and perhaps irritates it further. Will the steroid stay local enough that it’s not a concern for a possible pregnancy in a week or do I need to skip the injection?