Hi, if this is the steroid cream I think it is, don't use it. Check the label and if it contains cortisone or hydrocortisone, avoid it! All you will do is thin the already thin skin of your stretch marks. If it isn't working anyway.....
What else to do? Try having cool showers instead of hot. Get one of those gel filled pads for bumps and sprains and cool it in the fridge, but watch out - don't want those babies to get frostbite! Make sure it is just cool and wrap it in a teatowel so it doesn't freezerburn you. you could try calomine lotion, or I used to get something called Lacto-calamine lotion when my two were wee. It's like calomine, but is creamier and doesn't dry out like calomine. THis might be more soothing. There is also the cream for "feminine itching" - can't remember what it is called, but it is in a yellow tube I think. It's not canasten, I think it has a numbing ingredient. Obviously check these recommendations out with your doctor, health visitor or pharmacist. I've got no medical training and don't want to be responsible for any adverse effects!
When I was pregnant, a nurse put the baby monitor on my tummy (with a huge elastic strap around my body). Later, another nurse came to take it off. She gasped as she was doing it and said "My goodness, look what the monitor has done to your skin!" I looked, but there was nothing out of the ordinary, so I said "Those? That's just my stretch marks." She replied "Those are the worst stretch marks I've EVER seen!" Just how to make someone who already feels like a beached whale feel good about their body!!! LOL