15 weeks 5 days very lightheaded?

Sam • Baby boy #1 March 20 2018💙💙,Baby boy #2 October 16 2020💙💙,Baby girl #3 May 3 2023💗💗 Baby girl #4 Due January 18 2025 💗💗

Anytime I stand too long in the same place or walk especially inside the mall or store I get very hot and lightheaded anyone else? Is it normal?