Hey Penny! First of all I want to say I hope you get whatever you want....whether it is to be pregnant or not.
Secondly Oh my gosh yes to your questions! Most of us on here(myself included) have had a thousand a preg symptoms only to receive a BFN.
Then the next month, just when we think we are out of the game, we get our BFP!
I can name numerous times when I thought I was preg by my symptoms. but then there were other times when I was preg and had symptoms really early. For example, the last time I was preg. I would gag when I was brushing my teeth...that is when I knew something was up and I was only 12dpo.
I think it depends on each of our body types, hormones, etc....