Plan B

So me and my boyfriend are long distance and we're planning a date night soon and we're planning to have sex, but he doesn't like condoms because he says he doesn't feel much in them. We're both clean of stds and sti's and he wants to just simply do the pull out method, but I'm to iffy about doing that alone so I looked at plan b(I'm not on birth control and I don't want to be, I plan to use it as a safety net for this one occasion). My concern is that I'm a little over 200lbs and there was this concern that plan b is ineffective in women over 165lbs. Has anyone over 165lbs took plan b before and does anyone have any advice??