Need opinions

My husband and I have decided to start trying to conceive. So after being on birth control for the best 16 years, I finally went off of it this past July. I have not had a period since. I’ve felt period cramping, dizziness, light leaded, some nausea and just a little bit of nipple tenderness. I’ve taken 3 tests since July and they’ve all been negative but I haven’t taken one recently. Should I test again? Or maybe it’s just because I’ve been on BC so long, this is how my body is reacting? I’ve also been stressed out because of work lately. Any suggestions or opinions would be greatly appreciated!