TMI super itchy and irritated anus?!

im 7 weeks pregnant, basically for like a week now Ive had a super itchy anus, burns and kinda swollen, I've tried antifungal cream (temporarily helps) desitin for rash (does nothing but burns) hydrocortisone burns as well. gonna try some witch hazel tonight, any ideas of why? I read it could be a yeast infection or external hemmrhoids but I've never had either there so I don't know, it's driving me insane