Missing periods after MS - please advice

[mia1972]

Hi, I have had my second miscarriage in May, first one last December. It seemed that my body was resetting itself, I had bleeding for 2 weeks and then 4 weeks later my first period which was really heavy. Since them I have started a diet (not too drastic just a bit more careful) and have started doing exercise to get myself into shape. Now my period has decided not to arrive at all...it's over a week late (I am not PG).
Can anyone suggest what I can do? Do I need to stop the exercise and diet? How do I get in shape again for a new pregnancy is so ....I ended putting on 1/2 stone between the 2 pregancies ...Do I need to take supplements?
Any advice would be appreciated...
Thanks to all...