Little back story.

I was trying for i was trying for 2 and a half years to concieve after a misccariege back in late 2015.

I recently found out I was pregnant in Late september 2018. I was 6/7 weeks along when i misscaried again in early october 2018. Ever since i have been taking pregvit folic acid. Ive been trying since and no luck. Me and my partner voth got tested and we are all good and healthy so not sure what could be causing me not to get pregnant. Any advice or tips.