Apply coconut oil or bio oil and if itching is too much apply lacto calamine it gives instant relief. You can start applying it now

From which month should i use anti stretch marks creme or oil??

Keep your body moisturised all the time. Have lots of fluids. It is the start of stretch marks. Don’t scratch much else it will increase. Apply a good anti stretch marks cream like palmers. Mamaearth or biooil

Apply coconut oil and do massage

apply coconut oil or lactocalamine