Please HELP!!!In need of advice please.

I've had three miscarriages in 2015 the most recent being in the beginning of december. All in which seemed to be each be harder then the one prior. The furthest I've made it is 8 weeks. With no explanation of why it keeps happening. So in the last few days I've been getting faint positives. I'm torn in telling my husband that I'm pregnant again but I've been having all the classic signs so even tho it's faint I'm positive I'm prego. What do I do??? Should I tell him or should I wait incase I miscarry again??? Please help....