Seeing stars?

So I never understood the term "seeing stars" until a couple weeks ago. I'm 7 months pregnant and every time I've taken a shower or get up fast I see bright spots in my vision. It lasts about 5-7 minutes and I'm not very sure why it happens. I googled it and it said it happens when you're about to faint but I've never felt faint at all. I don't get lightheaded or get the feeling that I need to sit down. Should I bring this up with the doctor at my next appointment or is it normal?

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