Fainting during 31 weeks???

I have never fainted in my life.. and even during first and second trimester i have never felt any dizziness or fainting..

But from past two days im having constant nearly fainted kinda of moments... yesterday also i felt the same and I had breakfast and after that i felt better... but today even after having breakfast im still feeling the same near to faint kinda of feeling

Is this normal or should i go n check with the doctor?????

Has anyone ever felt the same during last trimester???

Thank you in advance