Nauseous/headache 33 weeks

Today after breakfast (croissant and small decaf latte) I suddenly felt really nauseous and got a bad headache and felt faint and weak then I threw up. I called my doctor, who had me come in for blood work and to check my blood pressure. Blood pressure was normal-ish I think. Feeling a little better now but still worried. Anybody experience something like this in the third trimester? Or have an idea what it could be? Maybe food poisoning? Side effect from my TDAP two days ago? I think I'll get the blood and urine results later today. At least I hope I will.