Will someone help me and tell me how to use monistat

So I sound stupid and I posted yesterday about thinking I have a yeast infection and I got the results back today and it is a yeast infection. She was super short with me and was like ok use monistat 7 and you’ll be good and only put the applicator halfway in. I’m like okay...well I got it and imsuper confused. I’m 21 weeks pregnant now and never in my life had a yeast infection. It is really bad and my clit and all in my lips is extremely itchy too. So I just fill a tube up with the medicine and put it alll Ofer the outside and inside of my vagina ? :(

And do I not have sex until the medication is done? I had sex 2 days ago with my husband does he beedto get tested ?