Terrified that I'm pregnant with my rainbow baby...

On September 26th I lost my only daughter at 6 weeks old, my husband and I are still struggling to deal with her loss, so much so that we separated on New Year's <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>. But now my period is late, and I'm terrified... what do I do??? Obviously I want another child, but this would just be the worst time. Do I tell my husband?