I guess it would be fine - I had awful issues with pregnacare (including highlighter yellow pee!) so ended up just taking a folic acid and vit D supplement from Superdrug as you get all of the other vitamins from your daily diet and the pill is very little and easy to take!
I'm sure it would be fine! As pp has said however really you just need to focus on vit D and folic acid (both of which can by bought separately and are very small tablets), so if you don't get on with pregnacare you might want to just think about buying those.
I started out taking the Solgar ones, which are quite big and I found them hard to swallow - have since switched to the Boots ones with ginger which are easier to take. One tip - take them in the evening rather than the morning, I found they were less likely to make me gag then (may have just been the morning sickness) and take them with a glass of milk or juice if you find the taste of the pills is unpleasant.