Ttc tips please help

My husband and I have been ttc since 2014. Wanting to add our fourth and final child to the family. First three pregnancies happened right away. We’ve had two MC since 2014. We havent had any luck since our second mc in 2015. Since the end of 2016 my cycles have become irregular. One dr said that I wasn’t presenting enough symptoms to be PCOS. Said she would run blood work in three months time Incase. That was last year and she moved in the second month. I can’t get into to see my regular family/Ob. He’s so booked up it’s not funny. There are no other drs accepting patients in a 40 mile radius. They are apparently also full because they’ve had drs leave. I’m taking prenatals now, but is there anything else I should take? Is there something else we should be doing?