What Cause Miscarriages?

Hello Doc! my age is 34 and had two miscarraiges in past three months. we have done the chromosomal analysis and that report is normal as per my gynac. since the report is normail she is wondering how two miscarriages happened hence she suggested Laproscopy test to be done. My question is--- is it required? can i try once again for pregnancy without this test? she was insisting because of my age facotr. Please guide. Thanks