Almost fainting in the mornings? 22 weeks

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No idea what’s causing this but it seems like most mornings when I’m standing at some point I start feeling like I’m randomly getting out of breath and then soon after I start to feel light headed and I have to quickly lay down before I pass out and then I feel better.. this happened only once during my first pregnancy and the Dr wasn’t concerned and just said it happens sometimes but now it’s happening almost every morning and I don’t know why.. blood pressure maybe? I’ll bring it up to my Dr at my next appointment but wanted to check on here and see if anyone has something similar happen to them