Good point.
If we look what "begotten" means in the Old Testament as well as in the New Testament through Bible lexicon definitions, we will find that the word "begotten" in Psa 2:7, with Strong#H3205, in Hebrew "ילד yâlad" BDB defined it as means - to be born, beget, to beget, of child birth, to beget a child and etc.
And "begotten' in John 1:18, with Strong#G3439, in Greek "μονογενής monogenēs" means as - only-begotten in respect of peculiar generation, unique, etc.
We can now see the difference, in the OT as "to be born" (future) in the NT as "only born, unique, peculiar to generation (present)
Thus, the bloodless Word that was God, need to became human/flesh to shed blood for mankind's salvation in faith.
The uncreated Word God's nature never ceased as God, through His prerogative, emptied His form of God and take the likeness of man to finished the plan of salvation.
Psa 2:7 "I will surelyH3588 tellH5608 of the N1decreeH2706 of the LORDH3068: He saidH559 to Me, 'You are R1My SonH1121, TodayH3117 I have begottenH3205 You.
H3205
ילד yâlad
BDB Definition:
1) to bear, bring forth, beget, gender, travail
1a) (Qal)
1a1) to bear, bring forth
1a1a) of child birth
1a1b) of distress (simile)
1a1c) of wicked (behaviour)
1a2) to beget
1b) (Niphal) to be born
1c) (Piel)
1c1) to cause or help to bring forth
1c2) to assist or tend as a midwife
1c3) midwife (participle)
1d) (Pual) to be born
1e) (Hiphil)
1e1) to beget (a child)
1e2) to bear (figuratively - of wicked bringing forth iniquity)
Joh 1:18 R1NoG3762 oneG3762 has seenG3708 GodG2316 at anyG4455 timeG4455; R2the onlyG3439 begottenG3439 GodG2316 who is R3in the bosomG2859 of the FatherG3962, R4He has explainedG1834 Him.
G3439
μονογενής monogenēs
9x: only-begotten, only-born, Luk_7:12; Luk_8:42; Luk_9:38; Heb_11:17; only-begotten in respect of peculiar generation, unique, Jhn_1:14; Jhn_1:18; Jhn_3:16; Jhn_3:18; 1Jn_4:9.