it is completely possible... the 19th would have been your CD(cycle day) 8. While that is a bit early the 25th and 26th would have been cycle days 14 and 15 and -provided you ovulated in that window- then the timing would be very high for conception to occur. Seeing at it is almost the end of April I must ask if you have taken a home pregnancy test?
Another question would be if the time after your LMP you had any unusual stress? That could delay ovulation which would in turn extend your cycle.
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