u/Motor_Process_5397

Hi! I am scheduled to do my IUI tomorrow CD22 (7/6) when I went to my clinic on 7/4 CD20 to check my lining still had fluid and was only about 4.8 mm thick. I was prescribed estradiol and took a total of 6mg in about 24hrs per their instruction. Has anyone had fluid in their lining that needed to be aspirated before IUI? Or has done an IUI with a thinner than ideal lining?
7/4 showed a 16.6 follicle and an 18.8 follicle, I triggered with Ovidrel at 2pm CD21 for a 2pm IUI on CD22? Anyone else do a 24 hr trigger before IUI?

I’m in my first letrozole + IUI cycle after a hysteroscopic polypectomy last month. I’m feeling anxious and would love to hear if anyone had a similar experience.
My history:
31 years old and have hypothyroidism and PCOS
Trying to conceive for about 11 months
First medicated IUI cycle
HSG showed both tubes open (though my doctor noted some inflammation on the left side)
Hysteroscopic polypectomy about 5 weeks ago
Small uterine septum that the clinic isn’t currently concerned about

This cycle:
Letrozole 2.5 mg CD3-7
CD12 ultrasound showed:
Several Follicles the largest ones measuring 14 mm, 13 mm, 12 mm, and 11 mm
Endometrial lining 4.43 mm
Fluid in the uterine cavity measuring 1.61 cm × 0.47 cm
My clinic scheduled a repeat ultrasound on CD15 instead of cancelling the cycle.
They said if the fluid is still present, they may try to aspirate (suction) it before the IUI, but it isn’t guaranteed they’ll be able to.
If the fluid persists after ovulation, they mentioned possibly repeating the HSG and/or doing an endometrial biopsy to look for infection or another cause.

My questions:
Did anyone have fluid in the uterus before ovulation that resolved on its own?
Were you still able to proceed with IUI?
Did anyone have fluid aspirated before IUI?
If you had fluid, what ended up being the cause?
If you got pregnant, did the fluid affect implantation at all?