Could I be pregnant?

So I should have gotten my period this past Saturday .. I usually get cramping on the day and nothing to date. I’ve taken 3 pregnancy tests all negative.. I’ve been exhausted and napping when I NEVER nap.. some dizziness and nausea..

I feel so defeated.. could I just have a really long cycle this time around or could I be pregnant and it not be registering the hcg??

I’ve had a friend tell me that she never tested positive for her first and she had to have bloodwork done to verify.. should I wait and test again? Help!! 😫😢