So I finally installed a heater in my aquarium (way overdue) and my female guppy seems pregnant? She's seemed this way for a little while, possibly waiting for the conditions to be warmer considering the male died a month or so ago. She seems pretty chubby and has line indents on both sides of her stomach (which could maybe be squaring off?) She was sticking around the heater for a while, then would dart around a bit, as if she had a lot of energy. Any second opinions would be great! Thank you!