The big "O"

Ok lets say I took an opk today and It showed a definate positive, so that means I should ovulate within 12-36 hours right?

Then after I ovulate, if I do, the egg then will be "alive" for 12-24 hours?

And sperm lives for 3-5 days, if the conditions are well?

The only reason why I'm asking is cuz everything lined up last month and I didn't get pg, in fact af came 2d early with spotting the day b4 ( that never happens) and even if af came early then ovulate came early and it was still in the same time frame I bd. Ik u only have a certain percentage to get pg every month its just weird is all.