Multiple Chemical Pregnancies

My husband and I have been ttc for 14 months. I have PCOS and have only ovulated 3 times during that time, with the help of metformin. 2/3 times we conceived. Good odds but I only had faint lines for a few days before losing both pregnancies. They were considered chemical pregnancies as both happened before 6 weeks. Has anyone had multiple early miscarriages and went on to have healthy pregnancies? What can I do to aid in implantation/prevent this from happening again?