Ay, 5 days delayed na talaga, I know na nerve-wracking yan, lalo na kung regular ka usually! Best thing is to get a pregnancy test muna (you can grab one sa any pharmacy or convenience store para sure), kasi sometimes stress, hormonal changes, or diet shifts can delay things, pero it's good to rule out pregnancy first para sa peace of mind, no? If the test is negative and your period still doesn't come in the next week or so, or if may ibang symptoms ka, definitely check with your OB kasi they'll know what's really going on.