could use some advice

My husband and I have been trying to conceive since 2010. In 2014 we finally got pregnant but I miscarried the day we found out. So good news followed by bad 2 hours later. And in 2017 we got pregnant again. We were pregnant for 2 months and miscarried again. I went and got lots of test done. He said I shouldn't have any problems conceiving. (which obviously I do if it's taken so long for each one) but he said once I do find out I'm pregnant I need to be seen right away and get shots of progesterone so that the baby can grow and thrive. Because I don't naturally produce enough. Any tips on what I could do to get pregnant easier. Like vitamins or anything. I'm currently dieting. Just started and going to be doing a juice plus program. Was thinking about taking the first response couples pack vitamins for pregnancy pregnancy and see what happens.