Spontaneous periodic leg numbness

Hi all. Today I am 12 weeks 😊. So glad to be at this stage and can relax a little more. For the last week I have been experiencing leg numbness in my right leg, it comes and goes and only last for a few seconds at a time but sometimes it can make me lose my balance and I almost fall over. Anyone know what this maybe? Is it normal? Anyone else experiencing the same at 12 weeks? This my 3rd pregnancy and it's the 1st time I've ever experienced this. TIA. Xx