Stress and pregnant!?

So i just found out that I’m pregnant and I’ve been stressing pretty bad, i had a miscarriage not to long ago and hoping this one sticks but my sister in law is staying with us for two week and i love her an all but she’s stressing me out... she can be very ungrateful and rude (she’s only 16 so kind of expected) how do you keep yourself calm? I try to stay in my room for a bit or do something alone but she’s always up my butt, help!