Lifting heavy when pregnant

So tonight we had a tornado warning and went to the cellar. The door is very heavy and it was only me and my two young kids. After the storm passed I went to lift the door and it was extremely hard to open. I used my whole body to open it and now my arms, stomach and back are sore. I regret not having a family drive over and open it for me now. Could I have hurt baby? I’m 16w 3 days. I’m so worried.