Best Birth Control for LDR besides Condoms?

I'm in a LDR right now and I usually meet my boyfriend twice a year for about a week each time (he lives abroad and is also in the military right now)
We always use condoms when having sex but afterwards I always get so stressed that something could have gone wrong and I could be pregnant, even during the sex I stress about it and I can't relax so the sex hurts 😕 is it worth going on the pill just for 2 weeks a year? Would it be possible to use it for just 1 month at a time? Sorry if this is a stupid question haha 🙈