Nausea, heartburn and a bitter taste

Since last night I haven’t been feeling myself. I had heartburn so bad I had my limit of TUMS, as well as nausea last night but I thought nothing of it.

I was fine when I woke up this morning, I had some toast for breakfast, but after some cheese puffs I had a really bitter, kind of soapy taste in my mouth. I also feel nauseous again, which went away for a while and after lunch it came back again, as well as feeling rather warm in flashes and a feeling of a lump or something in my throat.

The baby’s okay, I feel him moving around, but he’s way more active than he normally is.

My mother-in-Law said it’s probably just pregnancy, but I’m still worried. Anyone know what could be causing this?