I would ask your doctor. They know your health better than we do and could give you the best answer. I hope you can go though! I love aquariums :) good luck and congrats on your new pregnancy!
I've had several miscarriages and each time the doctor has assured me it's not because of something I did. As long as you feel ok and aren't pushing yourself I wouldn't be too worried. Also, the risk of miscarrying drops significantly after 3 months. Just mention it to your doctor if you're nervous.