Help with penetration post inflatable ED?

12 weeks post op Inflatable ED

Tried to have penetrative sex for the first time but couldn’t get it inside

I can tell there’s about 1/4-1/2 inch of space between the tip and the end of the device, but it doesn’t seem irregular, that’s exactly how they described how it would be implanted

I do have larger than average girth (~4.5-5” circumference)

Does anyone have any experience/ tips with penetrative sex?