Turshe - you can be pregnant even if you haven't missed a period. As for the latex, try using lubricant. You could be allergic to the latex, but try lube first. Because non-latex condoms are not as effective.
Condoms usually dry me out down there and it is very uncomfortable, so at least try it.
As for the spotting, I am not sure what that could be. If you were on the pill and had spotting I could help ya, but I don't know what it could be since u r not on the pill.