My girl was the same at that stage lah, and honestly it's quite normal as your skin stretches rapidly. For the itching and tightness, I swear by keeping moisturised throughout the day, and I used Mama's Choice Stretchmark Cream and Serum during my pregnancy because they're formulated to be safe for mums and baby, and they really helped with both the itch and preventing marks. Some friends also found that staying hydrated and wearing loose cotton clothing made a big difference, especially at night when the tightness felt worse.
moisturize regularly, it helps with the itch. but for stretch marks, you can try those oils/creams but it's actually genetic so if you are prone to getting stretch marks, the oils/creams may not help. on the bright side, the stretch marks can heal after you give birth!