I don't feel pregnant..

Myranda
My <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says I am 5 weeks and 4 days.. But I think it's off. My periods were very irregular and going by my last period makes me way more pregnant than I think I am.. But either way I've been having this fear that I am not really pregnant.. I have 3 positive HPT's but for some reason I keep thinking we are going to go to the doctor and find out I am wrong and not pregnant.. :/ I guess I need the doctors confirmation or something? Anyone else dealing with this?