Visiting the US while CR-1 in progress

[Kammo 2]

I did post this in the visitor visa section a few weeks back, but I thought I would try putting it here as some one may be doing something similar...

My husband and I live reasonably close (quick ferry ride away) so I visit him regularly. I have been blessed with a year of maternity leave, so traveling freely has been an option and I have taken it.

We just did the calculations for how much I have been in the US since Jan 1, 2011... We are at about 100 days currently.

How much is too much??

I know I cannot exceed 6 months at a time and I don't plan to do so, but what if all my shorter trips exceed the 6 months for the entire year?

When does the 6 month thing reset? Upon returning to Canada each time OR on a specific date? January 1st?

Generally speaking, the routine has been that I stay in the US with my husband for about 3 weeks and then return to Canada for 2 weeks.

We are currently at the NVC stage for our CR-1, maybe we would be approved before it matters but what if we are not?

Any advice for the travelling? Obviously we don't want to stop what we are doing unless it poses a risk for denial at POE or causes an issue with our visa.