Am I PG?

I'm staring to lose hope. I turn 41 on Feb 15. I've been TTC baby #1 for over 2 yrs. I had a D & C and hysteroscopy surgery in May 2016. Once we got the ok to try again in June 2016, we started trying again with no luck. I believe I've had a miscarriage since then before we even knew I was PG. I haven't had a period since Dec but all 3 test I've taken are neg. Have bad lower back pain, severe fatigue, always nauseous and many other symptoms. This is so confusing.