birth control no go...but what about plan B?

Ok... Some background on me before my question....so I'm the kind of girl that gains a sh*t ton of weight, hair volume loss, acne, mood swings, horrible month long + periods with every birth control I've tried. (I've tried enough, believe me, over it). Now, my relationship is long distance. So a good majority of the year, I don't have to worry about it. But for when I visit him, he visits me, whatever. It's usually a week long. We've been lucky (ugh..) times before. This last time I took Plan B and called it good. This next visit I'm wanting to prepare, or at least know what I'm doing to my body/is this an ok route. I plan to take the Plan B again. We don't use condoms (hahaha I know, it's a mess). Because we both hate them with a passion. Would it be ok to take the Plan B just before the 72 hour mark, and then again at the end of his visit just before the 72 hour mark? My body isn't ok with BC, so I'm really wanting to just do the Plan B as necessary since we're together 3 weeks out of the year. HEEEELLLLPPPPPPP. Thanks 💜