What is the preferred ROUTE and SITE of administration of Inj HCG 5000 for a pregnant female?

What is the preferred ROUTE and SITE of administration of Inj HCG 5000 for a pregnant female?

My cousin is pregnant right now…She has conceived after 2 spontaneous abortions.She had consulted an OGcian where she advised her on HCG weekly once .

Current pregnancy, she has conceived naturally and not by IVF

Intramuscular ,buttock