when can we have sex?

Becca • Newly pregnant through IVF, after TTC for two years.
When can we have sex? We haven't been able to since before starting Stims, that's a month and a half! Not even orgasms. 
We have our 7 week ultrasound tomorrow and I'm praying for two things #1 that there is a healthy baby and #2 that we can have sex! (And that I don't have to take any more endometrin that makes me chalky).