Anyone else bfp after multiple miscarriages?

Jessica
I am on my 3rd bfp this year! Lost one in early June and than again at 13 weeks in September. I am happy but so worried. I thought I was safe the last time but bam the heartbeat just stopped. I have gone through a ton of testing and they haven't found out why I keep misscarring. I already have children so it's just crazy that my babies heartbeats stop. Anyone else have this problem? Any advice or secret teas that can help. The last time I used raspberry leaf tea, took folic acid, omega 3s, and prenatal vitamins. I'll be doing the same this time plus low dose aspirin my doc told me to do. Fingers crossed my baby's heartbeat doesn't stop and that I actually get to hold this one in August!