Nas,
I don't know whether you've been given any specific instructions on how to use Vagifem or estrogen cream. To minimize any systemic absorption and to ensure the estrogen goes to the periurethral area, you want to apply it to the lower-third of the vagina. You may find Vagifem is more effective if applied in this way. Worth a try.
"Vagifem® was applied in postmenopausal women either in the lower or upper third of the vagina. Estradiol levels along with Doppler velocity measurements were made both at baseline and after 2 hours. Application to the upper third of the vagina resulted in statistically significant higher serum estradiol levels but only a small absolute difference compared to the lower third of the vagina. Also, with application of Vagifem® to the upper third of the vagina, there was a decrease in pulsatility index and resistance index which was not seen with lower third application. Thus, the first pass uterine effect appears to be exclusive to the upper third of the vagina. With application to the lower third of the vagina there was preferential delivery to the periurethral area."
"... when vaginal E2 tablets such as Vagifem are used for a local cure of vaginal atrophy, the least possible impregnation of the endometrium is desired to limit the risk of hyperplasia. Consequently, E2 tablets should be positioned in the lower third of the vagina, which will also optimize the desired effects on periurethral vessels. Proper positioning of the E2 tablet Vagifem is not intuitive, however, because the manufacturer provides a long dispenser and instructions for deep placement of the tablets in the vaginal fornices."
Sources:
“First uterine pass effect” is observed when estradiol is placed in the upper but not lower third of the vagina
https://www.fertstert.org/article/S0015-0282(04)00089-5/fulltextLocal Effects of Vaginally Administered Estrogen Therapy: A Review
https://pmc.ncbi.nlm.nih.gov/articles/PMC3252029/How to apply estrogen vaginal cream:
"Spread the cream into the vaginal/urethral area. As the cream is spread,
make sure to cover the urethral opening and just inside the vagina as this
is where most estrogen receptors are located. It is not necessary to push
the cream high into the vagina."
Source:
https://www.med.umich.edu/1libr/urology/EstrogenVaginalCream.pdf