vomiting w/ blood (2nd trim)

So ever since I started second trimester I've gotten these random bouts of severe nausea where I'll feel fine all morning and then suddenly have to run to the toilet and throw up, and then I feel fine the rest of the day. Anyway, I saw my doctor yesterday so he knows about it and didn't think it was anything to worry about, but then this morning it happened again. I ate breakfast around 8:30, took a shower, ran some errands, and then started to drink some tea and around that time (10:45ish) I had to run and throw up. But this time it felt a lot more acidic/burning and there was blood in the vomit. And now when I spit there is blood in the spit too and my throats feels kind of raw and scratchy. I'm just wondering if I should go to urgent care or wait it out and see if it gets better? Everything I've read says blood in your vomit is something to take seriously and that it usually only occurs during first trimester when you're vomiting a lot, but I've only vomited once or twice a week since I got to second trimester. Anyway, any thoughts or advice would be so appreciated. Our baby looked good on the ultrasound yesterday but now I'm so worried. :/