Trying to conceive after miscarriage?

Hi ladies, I was wanting some help and advise on ttc after a miscarrage. It has been three months since I lost the baby and we are going to try again. How long did you wait? Also I have found just before my last two periods I have been an emotional wreck cranky, sad, crying then happy and no idea why or how to explain it. Also did your periods go back to normal? Thank you for the help in advance.