Irregularities

I'm beginning to think that something is wrong.  The last three months, my cycle has been pretty messed up.  Here is a breakdown:

August
Began spotting 6 days before period started
Period lasted 4 days
Cycle was 33 days (month before it was 30 days)

September
Began spotting 8 days before period started
Period lasted 5 days
Cycle was 36 days

October
I began spotting 5 days ago
Not sure when my period will start
If I have a 35 day cycle, I will have begun spotting almost 2 weeks before my period

I've read that the spotting can be from low progesterone levels.  I'm trying to decide whether to call my doctor and go in for some blood work.  I'm always worried about it at night, as I'm laying down to go to bed.  It's when I really think about it.  I'm just tired of having an almost 2 week period!  Today at church, I was reminded of one of my favorite verses-

"The Lord will fight for you, you need only be still." - Exodus 14:14

I'm rest in that verse tonight.