Meanwhile I will gain post my answer.
It seems that you are unable to see my request for information.
If partner B has not ejaculated and you had protected intercourse most of the time ,you should be having pregnancy with partner A.
It is extremely unlikely that partner B is the father as there is only a theoretical chance of pregnancy with partner B.He did not ejaculate and had condom off for a short time.It mean that only his pre ejaculate came in contact with vagina.
The pre ejaculate does not contain sperm.But there is a theoretical risk that sperm left over in urethra after previous ejaculation is carried in pre ejaculate.
In normal course urinating washes off sperm in urethra after ejaculation.
So the chances of partner B being the father are extremely low and theoretical only.
If partner B had intercourse on 22nd that makes it simpler.
You should stop being guilty.The sperm survives in female genital tract for 72 hours at the most.Therefore if ovulation occurred on 26th partner B could not have caused pregnancy even in the rare theoretical case that he introduced some sperm into your genital tract.