Late period, negative pregnancy tests

My period is 4 days late which is highly unusual because my period comes like clockwork every 27-28 days. I had unprotected sex 2 days before I ovulated (the hearts on picture), he finished inside both times. I spotted the 13th-14th of June. It was minor spotting, light pink and only lasted 2 days. My period are always heavy so i know it wasn’t my period. I took a pregnancy test a day before my period was expected to come (june 15th-16th) and another the day of my missed period (june 16th-17th) i took one more the 19th. All came out negative. I had symptoms of pms and early pregnancy (tender breasts, darker nipples, light spotting) what are my chances of being pregnant?