Menopause/Pregnancy/Periods?

Hi, I got my period on Sunday but although I have the cramps and back ache etc, very very little blood - in fact hardly any at all am 38 and wondering whether my periods are slowing down or whether I might even be pregnant - should I do a pregnancy test? I am on the contraceptive pill and am dreading the thought of approaching menopause this early! Any ideas? Thanks for reading ... x