BFP Round 4...

Got a bfp for the 4th time in my 3 year marriage. But 8 days before my period is due? I took it this early knowing my cervix changes and knew within 3 days of sex I had conceived. Anyone else get a bfp this early?! Should I be preparing for another blighted ovum?? I have one son, two on the 6th next week, & 1 angel baby (before son) & 1 pregnancy loss (blighted ovum at 9 weeks in April ). Praying so hard this baby stays. We've been trying for a year and a half. Little man keeps asking momma for a baby in belly please lol I've been praying like all I want for Christmas is a HEALTHY pregnancy.