There are two problems you face in a potential lawsuit:1) First, since the sour cream was handed to you and you placed it in the cart, proving that the supermarket was at fault by not sealing the cream properly may be difficult: the reason it opened, after all, could be that you opened it to taste/try it, or you squeezed the container too hard and popped it open, or you bumped the lid while placing it in the cart, etc. If you caused the container to open, the supermarket would not be liable. Because you would be suing, you have the burden of proof; therefore, you would need to be able to prove why and how the cream opened and that it was not your fault, which again, may be difficult.2) Second, even if you could prove liability, you can only recover for injuries, costs, and losses foreseeably caused by the accident. Medical costs for treating your ligament are foreseeable, from a fall, and you could recover for that. Some lost wages, for work missed *directly* due to the injury, would also be foreseeable. But it is not foreseeable tha an injured person would be a pregnant women, fairly near her due date, who would have to go on maternity early--that is not a normal, or foreseeable, consequence of a slip in a supermarket, and so you likely could not recover any compensation relating to having to take maternity leave early, limiting what you could get. So this is a case that may be difficult to prove and where you may be limited in the compensation you could receive.