Sir, Generally I Have A Cycle Of 26 Days. But

sir,
generally I have a cycle of 26 days.

but last time it come out in 21 days with cramping. initially bleeding happened but little bit lighter than the usual flow and after that just spotting for one day.

this time cramping started on day 18 with cramping. first few days just a little watery discharge come out and then today, on day 25, bleeding happened but much lighter and the colour is dark red or brown.

Am I pregnent?

Please help me to resolve the matter.