Last month a week before my period was due i had light spitting then my period came as normal. this month same but just had big clot? ttc. 31, healthy,

Your hormones: are likely in flux for whatever reason, and you would need to be patient to see if things would settle down. Menstrual fluctuations are affected by many different factors, including nutrition, psychological state of mind, stress, infections/ illnesses, etc. If things continue to be irregular or unpredictable in the next couple of months, get yourself to a GYN or family Doc.