TTC #3 but still a rookie

Jenny

So I never "tried" getting pregnant with my first 2 but now we really want our third and last baby so we are actively TTC...we had sex every other day during my fertile window and had sex on the day of ovulation. I'm 10dpo and couldn't help myself and tested...it was def negative. but I've been having these weird twinges and tiny cramps...do I still have a chance???