First IUI in 2 weeks any tips/advice?

I’m just waiting for my period and then I’ll start doing my OPK’s. Any advice she told me it’s about a 20-25% chance but maybe higher since I’m 20 and healthy all my hormones normal no signs of anything wrong. Any tips? Ive been taking my prenatals trying to eat fertility food foods and drinking water I’m so nervous but I’m trying to stay calm so I don’t stress my body.