Yes you can do that but remove the film once they start to grow or water will drip back down onto the seedlings.

ive put mine in plastic bags and seeds are showing already less than a week, my first veg haha, or fruit which ever a tomatoe is

Yes, a bag would be better as Sanbaz says. That way the seedlings can grow up without trouching the wet polythene, which would rot them.

i have used cling film on mine and its worked

Thank you so much. I sowed the seeds immediatly after receiving your advice and placed them in a bag. Checked them today and the seedlings have come through. so thrilled.

Wow - that was quick! Well done!

great , good news Rohima