I'm sorry girls, I've been married for a year but can't get pregnant this…

I'm sorry girls, I've been married for a year but can't get pregnant this month. I have already had a 5-day delay after 4 days of delay. I took a test and it showed a weak positive result. I want to be sure that I am pregnant, but my mom says it's too early to do an ultrasound. Could you please tell me if it would be possible to go for an ultrasound on day 6 of the delay?