Vomiting when I eat pork?

So, the past few times I ate pork (bacon, ham, sausage), I have thrown it right back up, immediately after eating it. With the first bite, I get nauseous. After a few more, I end up not eating any more because of how bad I feel. And, within minutes, I have to run to the bathroom to throw up. I googled it and saw the possibilities of pregnancy, food intolerance (I'm already lactose intolerant), and food poisoning. I know the pork was cooked correctly every time, so food poisoning is out of the question. Should I be worried?

My cycle length is usually 45 days, and yesterday was CD 64. I started spotting light brown, and assumed it was my period, because I'm on the Mirena IUD and it causes very light or nonexistent periods. Should I get a hpt? I took 4 of them a couple weeks ago, with no positive results.

Help!!!!!