Why the contraction pattern for 1 week ago and 1 year ago is different? I do understand that Japanese grammar is full of exceptions but maybe I missed some explanations earlier.
Why we can’t say like this?
1 月間前
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It’s because 一月 is “January,” not “one month.” If you’re talking about a period of time, it’s 一ヶ月, or 一ヶ月間.
Here’s a HiNative thread on it: [link]
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I got it now. Thank you
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Is the reading ikkagekkan?
No, it’s “いっかげつかん” an answer needs too many characters
Is it? 
Not いっかげつかん?
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Oh, I didn’t pay attention to the end of it, just the いっか part
一ヶ月前 or 1ヶ月前 is how I usually see it written.
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