Hello, I have gone through your query and understood the concern. If you have had regular monthly cycles after your previous conception, it is likely that you may have conceived since you had the intercourse around your fertile days. Yet, spotting, even of the implantation bleed is seen about ten days after conception. Moreover, increased bladder frequency is observed as the uterus increases in size due to the implanted embryo at 4-5 weeks or after the missed period. You can go for the blood test to confirm/exclude pregnancy ten days after the intercourse and in the current scenario, this is the earliest way out. Hope this helps.