Chances Of Getting Pregnant

tr 4 years of marriage i got pregnant and am blessed with a baby boy. now he is 4 yrs old and i have not conceived yet. so i visited a doctor to find out if there is any health problem. my menst cycle startd june7 2011, Dr suggested to get scanned, i got abdomen scand on 13june2011 in which the report came out normal however the endometrial cavity is empty, endometrial echo measured 6-7mm right ovary 37x19mm left ovary 36x19mm Uterus:retroverted, measures about 74x47x39mm with normal myometrial echo texture. r there chances of getng pregnant age 35, ht 5 ft 1 inch, wt 52 i heard if endometrial cavity is empty chances of conceiving will lessen pls i request ur advice regdng this endometrial thickness and conceving