Great you early days with invisalign are going so well Skoa!
Here's to you seeing progress soon.
If your mouth is feeling a little sore, a warm salt water rinse will soothe and heal. Make the rinse, by using a pinch of salt (about a 1/4 tsp) in a small amount of warm tap water (about 1/4 cup). Swirl the rinse round your mouth, gargle, spit and repeat. While your mouth is sore, repeat this as many times as you can throughout the day.
Good luck!