Psalms 139:16
Your eyes saw my substance, being yet unformed.
And in Your book they all were written,
The days fashioned for me,
When [as yet there were] none of them.
GaLMiY (My unformed substance)
Ra"U (Qal perfect , did see, 3 common pl. )
'eYNeyK (your eyes , common dual construct)
W-'aL (and in)
SiPhRKa (your book)
KoL-aM (all)
YiCTheBU (Niphal imperfect , were being written)
YoMiYM (days/daily ,common masculine plural)
YeTsRU (Pual perfect 3 common Plural , had been predetermined)
W-Lo" (and not)
"eChaD (one , common masc. s. absolute)
BaHeM (among them , 3 masc. pl.)
Your eyes did see my unformed substance, and in your book the days were being written; and not one of them [days] had been predetermined.
The Hebrew says the days
were being written (imperfect) as they occurred, not that
they had already been written (perfect) before they occur. The Hebrew says to me that God was noting days
as they were occurring in the womb in real time and remembering them (this noting and remembering expressed poetically as recording them in a book). It also says to me that not one of the days was predetermined, but to God they were all fascinating and novel in their detail as He watched my DNA guide my body's growth in the womb.
Blue letter Bible
YaTsaR -
TWOT reference 898
...
C. (Pual) to be predetermined, be preordained.