My period is late, I don't know is it because of the stress

Hi. There is always a chance of pregnancy with unprotected sex, you say he wiped the end every time he put it in but what about any precum that was actually in his urethra that could of contained sperm that would of been squeezed out as his penis was in your vagina.
You don't really give enough information like when he last ejaculated before it happened at what point of your monthly cycle you was at or how long after your period it happened.
If you have been stressed then that can affect your periods.
If your going to have intercourse again doesn't matter if it's in and out once then use protection and be safe.

He didnt ejaculate the day before and that day it happened on may 22 . I got my period around the first week of may. I went to the clinic on may 27 and i got my period same day i went to the clinic and its not spotting because theres lots and lasted for 5 days. I took pregnancy test on july 3rd in the afternoon it came out negative and the next day in the morning i took it again and its negative. Is is normal to have 2 periods in a month? Was that a possible reason my period is late ? Is thinking about if im pregnant and getting worried that i might be part of stress?

Yes it is possible and seeing as you missed June then it could of been that one come early.
Are you normally regular and do them always start the first week of the month?