Tips for ultrasound?!

Tomorrow I have an ultrasound and my boyfriend will be joining me for the first time so I want it to go perfect. At my last OB apt. my baby was sleeping & the doctor would poke around but baby would not wake up! The heartbeat wasn’t heard & hard to see (I have an anterior placenta). Is there anything I can do to wake up my baby & will having an anterior placenta always make it hard to see him/her?? At that last OB visit it was not transvaginal . Before that ultrasound when I was around 6 weeks, my ultrasound was at a different place (my OB sends me to), but they didn’t do transvaginal because she said I was tiny so it wasn’t necessary to but she never mentioned my placenta was anterior & my baby was still an embryo. Will transvaginal make a difference? Thanks in advance!