Practo consult, sk sir pls help. Right?

I was told by gynaec on practo to do a hcg beta blood test. Here is the series of events, pls help me out. Periods in Feb- 17 periods in march- 22 periods in april - 22/23 On 11 May- Unprotected rubbing of genitals on vulva vagina labia, no intercourse, no penetration and no ejaculation, no visible precum but was scared hence took an ipill on 12 MAY 16 MAY (day 25 of my cycle)- Bleeding started for 7 days, regular flow. Much earlier than my expected periods. Took many home tests after that, all negative. Went to doctor who said because withdrawal bleeding happened hence no pregnancy. Transabdominal ultrasound done on 7 june, no pregnancy. Consulted doctor on practo who said to do beta hcg so on 9th June- beta hcg report says 0.1 hence negative. Period expected on 16 june. Now if i miss periods or delayed then what is the reason? what to do pls tell me next steps. Cannot be due to pregnancy right?