Hey Flossie,
When i was pregnant with Tarleha i felt exactly what you're feeling and i also got morning sickness (didn't know that was what it was then) but i got it right from conception.
So yes it is possible you are pregnant.
I hope your TTC comes to an end soon i know how stressful that is.
Good Luck and DON'T stress. If there is a bubba doesn't need you stressing.