Is it ok if I use 2 different scar product? Mederma at day time and silicone sheet (or maybe Contractubex) at night? My scar is very new from surgery

Silicone best. Absolutely. Silicone gel products work much better than mederma in my opinion and are just as easy to use. If you can't use the silicone sheets 24/7 then use a silicone gel product during the day and silicone sheets at night.