18 weeks with twins

Be

18 weeks 3 days, and I've been feeling okay lately, besides extremely sore and tired. I've been trying to take it easy as much as I can.

I just did some tidying up around the house... all of a sudden i got drenched in sweat, out of breath, weak and nauseous... 20 minutes later and I'm still feeling sick and off.

Is this normal? Did I just push myself too hard...?