PLAN B PANIC

So me and my boyfriend had sex and it was in the spur of the moment, and we had unprotected sex I’m not proud of myself we were gonna get plan B but it says if you are over a certain weight it won’t work. Like I don’t know what to do I’m a good 260 which is waaaaaaaay over the weight minimum and I don’t want to take it and it doesn’t work but like I don’t want to not take it and I get pregnant. Please help 😭😭😭😭😭