Deductions & credits

so my now wife was on my health plan in 2018 and i was getting taxed for it but we got married in october 2018 so when that happens, can we recover all that "imputed income" for the prior 9 months or does the IRS only see you as married from that point forward?  just want to know how i can recover those costs since i got married and if allowed, how do i do it. does turbo tax automatically do this because how do my w2s indicate this?