OPK used, intercourse day before LH surge. Chances of getting pregnant?

We did not have intercourse the day of LH surge (yesterday), but did the night before and plan to tonight. Could I already have gotten pregnant or do we need to have intercourse again over the next two days in order to be successful? Calendar method says on my 32-day cycle, I ovulate today, but I had the ovulation pains yesterday. Thoughts, suggestions....please?