Definitely call to talk to your doctor and don't wait until your next scheduled appointment! I became so dehydrated from vomiting that I was passing out and had to have IV fluids. Once I was driving and had to pull over and wait for my husband to cone get me.
Even though your 1st trimester ends that is not an automatic switch that says ok good bye morning sickness. I had it until 16 weeks. My friend had it her entire pregnancy (even on the medicine) for both of her babies. Talk to your doctor.
13 weeks is the beginning of your second trimester. Go speak with your doc because there are great meds for pregnant women for nausea and vomiting. Don't put yourself through misery when you have options!! I've had vomiting for weeks, got meds, worked like a charm!! and now that I'm in second trimester I've been able to go days wth no meds and no sickness! It gets better