I ask for advice, is there a high probability that I am pregnant?

Good morning. My last relationship took place on 2.03. He was unseasy, while his partner did not end up inside. 04.03 I was at the gynecologist, ultrasound showed that the enodmetrium is 15mm. The date of expected menstruation was predicted at 06.03, but so far I have not received it. 09.03 I did a pregnancy test (supersensitive and one that can be done already 6 days after fertilization), came out negative. Today I did another test, it is also negative. I have such symptoms as before the period- breast pain, sometimes stinging in the ovaries, swelling. I ask for advice, is there a high probability that I am pregnant? I worry that maybe I did the tests too quickly, but it is already 5 days from the expected date of menstruation, which usually appeared as expected.