Just wondering...

My period is ALWAYS on time; it's like clockwork. Period lasts 3 days, 8 days after that, I ovulate, and 12 days after that, I start my period again. It's been perfectly regular for 10 years now.

But...

Last month it was 2 weeks late, and then it only lasted 2 days, and this month it was 2 days early and only lasted one day. Last month it was very light, and brown instead of red, and this month it was light pink with brown mixed in.

Should I take a test, or see a doctor, or should I just chalk it up as an irregular period?