Hello,
Welcome back to icliniq.com.
I am not so sure with the suitability of the protocol followed for frozen embryo transfer as ethinylestradiol (Estinyl) was seemingly used in excess as compared to progesterone alone, get (Crinone 8 %) which would not have allowed the endometrium to transit to the secretory phase of cycle and mature and become ready for implantation.
The endometrial thickness was less than 0.039 inches, and ideally, Estradiol levels should be more than 150 pg/ml and progesterone levels should be more than 15mg/ml on a day prior to the frozen-thawed embryo transfer. Progesterone dosage is to be increased from 50 mg/mL to 75 mg/mL if serum progesterone was below 15 ng/mL, and Estradiol dosage is to be increased by 2 mg oral Estradiol and/or the addition of vaginal Estradiol if serum Estradiol was below 150 ng/mL. So this is an important step. I hope you had some records. Also, this is the day when endometrial doppler study should be performed to check for endometrial receptivity as I mentioned earlier. Prednisolone and Aspirin can be started together as an anti-inflammatory and improve thinning of blood, respectively.
From your pap smear report it was evident that you did not have any cervicitis or inflammation of cervix but you have been or were suffering from bacterial vaginosis and candida infection then which if not treated by a seven days course antibiotics and antifungals before contemplating embryo transfer, then there are all chances of iatrogenic insertion of infection into the uterine cavity and infecting the endometrium causing endometritis which under inflammatory effect would render the endometrium. Non-receptive to a transferred embryo. I hope you understand what I am hinting at here. Once I reinstate the need for an endometrial biopsy report for histopathology before contemplating the next IVF cycle.
If there was no issue found in you with regards to menstrual irregularity and that you were ovulating regularly, then I feel there was no apparent need of undertaking an IVF cycle. Your husband with oligoteratoasthenozoospermia can be easily treated with antioxidants and sperm energizers for a period of three months (life-span of sperm is four months) and then after treating your local vaginal infection, I feel you should try naturally for two cycles post his treatment.
But most importantly with a history of multiple IUI earlier, with persistent vaginal bacterial and candida infection, raises suspicion over increased chances of endometritis. So please take a break for a month with natural cycle and get a mid-cycle endometrial biopsy study done after a high vaginal swab culture, ruling out any infection first and then avoiding intercourse till endometrial biopsy day. (This cycle would go waste though, but will help your body to recover from hormonal imbalance following IVF cycles). Also, if you have your earlier reports, ultrasound, HSG reports, hormonal profile, AMH levels, they would be helpful to guide you further.