Is my gf pregnant

We had sex 3 times. All 3 times with protection. But the last time I didn't cum she tried to make me cum by sucking it but nothing happened. she put it in her vagina for like a minute or so but I still didnt cum. We took 2 pregnancy test at home both negative. But her stomach looked chubby and she had pain on her lower stomach under her bell button. So she went to the doctor and they did a urine test and it was negative. The doctor said to wait intill her next period. But she has signs. she eats a lot, she vomited twice but very little and her breasts feel weird. And she hasn't had her period since. Nov 27 and the last time we did it was dec 28. I'm scared because her period usually comes on the 27 around there she didnt have her period and its jan 3. Is she pregnant. The doctor said that if she doesn't have her period this month there is A chance. But I need anothei opinion