Oh darling! Do you understand what they did? The point of tying was to NOT get pregnant. The process must be reversed in order to get pregnant
Ideally you want to have sex the day before you ovulate so the sperm is already there and waiting and soon as the egg is released.
2 days ago was good, but there are no guarantees.
My dr has said the best best time is 18 hrs after you get the ovulating symbol. He does say the sperm can live up to 5 days - girl sperms living longer. Tried this month so we'll see. My periods being tricky but I've had false alarms before so trying not to get excited.