worrying

I have been so worried lately. My SO and I have been having sex for 2 years with no protection.  Not tracking or anything just basically if we were to get pregnant then great if not we aren't worried about it.  Well the past 6 months I have been actually tracking and noting body changes, CM changes etc etc and my period is always 24-28 days in length, basically clock work within a day or two.  My period is always 4 days long.  Very heavy first and second day and then is basically completely over by end of day 4.  I have noticed that my CM hasn't been getting very EWCM the past 2 cycles.  Does this mean I am not ovulating? I have been pregnant before (I was 20 years old and ended in miscarriage, I am now 29).  I am worried something is wrong.  Is there any advice you could give me?  Supplements to take? We would love to conceive this year so any input on how to help this would be great.  Thanks so much in advance!