1) unless you're the size of someone on "My 600 lb Life", your weight loss so far is very normal. Most of us lose 15-25 lbs in the first month after surgery. Yes - you will find people who lose more or less than that, but they're the exception. You're in that range, so you're perfectly normal!
2) you're in the infamous "three-week stall". Almost all of us go through that. It's not ALWAYS the third week, but it is for most (hence the name) - but it can really happen any time within the first 4-6 weeks after surgery. Just stick to your program and stay off the scale if you need to. It'll last 1-3 weeks, and then you'll be on your way again. If you want to read more about it, do a search on this site for the three week stall. You will find about 17,000 posts on it (and no, I am NOT kidding...). It literally does happen to almost everyone. No changes necessary - just stick to your program and wait it out. It WILL break.
oh - just re-read your post. Thirty grams of protein is too low. Most surgeons recommend at least 60. So THAT is a change you should make. Otherwise, you're good. Just hang tight!