Yes absolutely you can be pregnant without symptoms. Many women go months without knowing they're pregnant, some even the entire pregnancy.
I am 23 yrs old. My last period was at the end of January. I had sex feb. 7th , and it is now March and still no period . Been cramping the last 2 days. I don't really have any symptoms of pregnancy. Could I still be pregnant with no symptoms???
08? Bring it back to the dealer!
A banging noise is pretty normal. The metal will expand and compress depending on the temperature. Has the banging just started recently? If that's the case you may have a problem and I would look into calling someone to come look at it.