10 days after possible conception sore breasts and light cramping my period is due in 5 days and no spotting is it menstrual symptoms or possible preg?

It could be: Either. If you miss your period, take a pregnancy test.

Both options: Sore breasts and light cramping could be due to early pregnancy as well as symptoms prior to the beginning of a period. The only way to know is to take a home pregnancy tests. Until then consider yourself as possibly pregnant and avoid things as alcohol , tobocoo etc.

Could be either: Having symptoms of sore breast, light cramping 5 days before a period is due could be either from a period that is coming or from very early pregnancy. Way to know is to see what happens in the next week. If no period check a pregnancy test 2-5 days after first day of missed flow. If a period comes likely your hormones were a little higher than usual causing symptoms.