Have had spotting 15days before a period was due i'm due in 10days and have cramping in ovaries and nausea and also lower back pain and abdomen pain could this be pregnancy or just period symptoms?

Uncertain: It could be premenstrual symptoms. Could have breakthrough bleeding (using term in a more generalized sense - since i don't know if you use oral contraceptives or not). If your period doesn't arrive when anticipated take a home pregnancy test. Take care.

Could be either: Symptoms of pregnancy are often similar to premenstrual symptoms. The only way to be sure is to get a pregnancy test. Remember though that the pregnancy test might not be reliable till 2 weeks from conception. This usually around the time of a missed period.

Either: Could be either. Don't do anythings that may affect a pregnancy, like heavy drinking or drugs. Get a pregnancy test and find out.