I get this I'm 23 weeks too. I passed out in work and I only work in retail sales so it's not exactly strenuous. I had the same yesterday. Its a drop in your blood pressure. Every second time I get mines done I'm low then back to normal. Normal pregnancy symptom though. Keep chocolate in your handbag or some fizzy juice, try and put your head as low between your legs as possible and it does pass.
Yes I am eating rite I think it has something to do with muscles cuz I have pain right behind my head like in my phony tail
I had this problem but it was my blood pressure. It drops a Lil when your pregnant.
Are you eating right? May be your blood sugar.
My doctor told me to drink Gatorade.