Pregnant?

Is there any mommy's on here who got pregnant right after having their baby? This would be my 3rd baby if am I pregnant. I had my 2nd son 2 years after my 1st so I'm not sure what to expect if I am expecting again so soon after having him. I'm currently experiencing back pain that I can't shake off, dizziness and light head. Also today I noticed I been more bloated than usual and I get fuller faster. My period isn't due for another 8 days. Thank you in advance.