32 female, married, average weight, non-smoker, healthy. March I had a 4 day period, one day break and then it started 10 days from light to med flow bleeding. I went in for a full blood work and doc found no pregnancy, no thyroid problem, no iron deficiency. This month of May, my period came on the 4th and it's normal day is the 16th. I am confused b/c fertility tests say my husband and I are fertile and we're trying to conceive our first child. My mom started menopause in her 50's and she was fertile with no history of fibroids. Any suggestions? I am due to take an ultra sound next week, what can I expect?