Hello!
Tee hee do you mean "broodiness"?
I don't think there's really any harm in starting on vitamins now. You could save yourself some money and buy some normal multivitamins for now but then switch to Pregnacare when you get to September. I can't remember why, but you should avoid Vitamin A when pregnant and normal multivitamins have Vitamin A. The only reason I suggest to take a normal multivit now is just to save some cash

I take one from Boots - £5ish for 180 tablets, whereas Pregnacare preconception is £10ish for 30 tablets. I'm sure you know this already anyway but really you should try to get everything you need from your diet and multivits are just a top-up. A lot of people don't even think they're worth bothering with but they certainly can't hurt.
Another thing you may like to consider is how much fish oil you're getting. If you eat fish regularly you're prob ok but if not a supplement could help. We get loads of omega 6 in our diets generally but not enough omega 3. So a fish oil tablet could help.
Sorry to go on about this, DH used to work for a large health food chain shop (won't name them, they're horrible! No free advertising from ME) so I'm lucky to have him available for advice
I know you're waiting til Sept but wondered if you're on the Pill or anything...it might be an idea to come off it now just to give your body time to adjust. It would be so frustrating to wait til Sept then find your body needs a couple of months to get back to a natural pattern.
We're waiting til June...not really that far away now but sometimes feels like it's a million years away. What are you studying, have you got exams to occupy you til September? Good luck!
x