A couple of things from my experiences with miscarriages:
1. I was told by my fertility doctor that your body needs to rest and recuperate after a miscarriage and that you really shouldn't try to get pregnant again for at least 6 months. That way your body can rebuild nutrients and heal from the trauma.
2. Also, it takes the average couple 6 months to get pregnant, so the fact that you were pregnant after 4 cycles of trying is really good.
I would give your body some time to rest and then start trying again. Did you see a doctor for your miscarriage? And to make sure that you didn't have any clots left over and that everything was expelled? That can be VERY important.
You can always go see a doctor, but many will do an initial assessment and then most likely tell you to come back one year after you started trying after your miscarriage, not before.
Good luck with everything. I know how difficult it can be when you are trying and really want a baby. I had 2 miscarriages and waited a year and a half before I finally got pregnant with my son.