Diaphragm? Retroverted uterus?

[chiquitaloca]

Hi, have nc for privacy.
I do not want to use hormonal contraception as it makes me gain weight/moody, etc. so I tried the diaphragm after being bored of condoms and I liked it.

The problem I have it's that is such a pain to get the diaphragm in place. I have a retroverted uterus and my cervix feels really far back and to one side. I am aware the cervix changes place during the menstrual cycle, but it was just 3 days ago where I put it on without any difficulty. Today was impossible, diaphragm getting in before the cervix (cervix very far back almost in the corner and sorry if tmi, but I could feel the pressure towards the rectum)

I've got the flat spring one, does using the arcing spring make a difference? Is the arcing spring one covered by the NHS. I am a new user, have only had sex with the diaphragm once.