All that soreness means muscle repair happening which uses a lot of water to do so. In order to build muscle you have to work it hard, that causes micro tears and the body uses glycogen and water in the muscle to repair it. This is why it looks like the muscle is "pumped" up after a workout and appears harder. It is not fat gain.
When people lift weights often enough, they may not see scale drops like before because your body will try to preserve the muscle you are using and get rid of the nonessential fat stores (this is good). Before you may have been losing muscle right along with fat and were seeing faster scale losses. Most people that lift will see sizes decreasing faster than the numbers on the scale. This is a better situation to preserve the muscle and lose the fat.
A better measure of progress would be a measuring tape, or just make sure you are weighing in at least a couple days after lifting weights. Once you get used to lifting, you may not get as sore for as long.
It is pretty hard for a woman to put on muscle very fast. Typical would be about a quarter pound a week if you are really lifting hard and eating at TDEE or above. Most of what you are seeing is probably water weight.
If all you care about is weighing less on the scale, keep doing all cardio, if you care about body composition and looking more fit, keep up with the weights at least 2-3 times a week and just take the scale weight with a grain of salt.
Good luck and I hope that helps!
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