Could be pregnant?

Ao after 4 years of 'trying' for a baby we stopped, never had a regular period so never tracked ovulation, periods etc... 6 months later I fell pregnant!! We now have a 10months old son and it's only ever since I had him my periods have been 'regular'. My period isn't due for another 6 days but I have had some light bleeding today with cramps. Usually my period is just full on from day one and super heavy.