Hi Bec, Welcome to BB

I did the same as you years ago before trying to conceive as in taking the pill and skipping AF's. The Dr's normally ask you to wait 3mths so as your body has a chance to try and regulate and also get the Pill out of your system before your conceive.
What has happend sounds pretty normal as I remember thinking the same as in my AF wasn't that heavy and didn't last long after the first month off the pill. You may find after the second month it will be heavier and more like a 'normal' period if you can remember what they were like.
Alot of Dr's also like to run pre natal tests before TTC, just to make sure everything is ok. These tests would normally be to check Iron, your level of protection against German Measles and full blood count and other one's that I can't think of.
Good luck with it all