Can someone explain

So I was cleaning my house earlier . I ate a waffles for breakfast with milk before I started . When I do a lot I always feel like I’m going to pass out . It’s really scary . I checked my blood pressure 117/60 then a second time about 10 mins later it went down to 97/55. Both times my heart rate was elevated 100 and 140 . This is the second time this happened to me and I’m not sure why . I drank water and everything . Does this happen to anyone else. I feel so light headed and dizzy 🥴 . I take frequent breaks too and I still feel it’s happening.

I checked baby’s heart rate after I sat down and relaxed for about 1 hour and it was between 140-156 (baseline for her)

Also I’m 29weekz and 3 days.