Is it normal for my left side of my head just to go numb for like 10 mins nd feel dizzy I mean im 7 months pregnant nd its the first time happening?

Not really normal. Vague symptoms but I certainly wouldn't call them normal or expected in a pregnant woman. Do you have a history of migraine headaches or something along those lines? Any nausea/vomiting associated with these feelings, light or sound sensitivity? If I were you I'd let the OB/GYN know what's going on and get a neurology consult done just to be crystal clear on your symptoms and what they could mean.