Bikini line shaving help please

So I am going on a girls trip this weekend and we will be on the beach lots, so this is lowkey an emergency lol!
But I always get the worst razor burn when I shave my bikini line, I found waxing did help and gave me amazing results, super smooth, no bumps or very minimal, but there is two issues with that 1) I waxed when I was pregnant and I had a really bad reaction so I'm nervous to do it again though I know this could be just hormones
2) I'm not able to get a moment without the baby until I leave and she gets fussy if she's in her stroller too long.

SO it's really looking like my only choice is shaving? I know they say shave downward and then sideways not upwards.. I'm going to do that, I got a shaving cream and a 3 blade razor.

Wha else can I do???