I need help!!

The past couple mornings when I get up I do my normal routine. I get up, start making my son and I breakfast and while breakfast is going I change him. Yesterday after I changed him I went back to finish breakfast and I had to come back and sit down because I felt like I might pass out. Everything was getting dark and my heart was racing, my heart was pounding and was so shakey. I honestly thought maybe i just needed to eat but once I sit down and calmed down everything was fine. It all happened again this morning! Even though I took my time and I tried not to move too fast. I’m not 100% sure on why it’s happening. I thought maybe low blood pressure but I’ve never had problems like that before so I’m not sure. Has this happened to anyone else? I hit 12 weeks Sunday and this is my second pregnancy I had no problems like this with the first.