Since you had a period and vaginal itching is NOT a symptom of pregnancy, I highly doubt it.

It sounds more like you got a vaginal infection or skin abrasion.  If it came right after a period, you could be having residual irritation from tampons or pads- it happens to some people.  You didn't change brands, … Read more

To put your mind at ease take a home pregnancy test or go see your doctor.

Sounds like you have a better chance of having a vaginal yeast infection.  The OTC medications for this can be found at any pharmacy and work very well.