embarrassing question about being pregnant as a virgin

I'm a virgin but im with this guy and we mess around. Though he has never been IN me he's been around the area with his penis. I'm only concerned because he has cummed but he makes sure im no where near and he wipes off. But I'm still nervous because I'm new to all of this. I'm six days late for my period (which I have had an irregular period in the past but not lately), ive been more tired than usual, sore nipples, and get nauseous (though this may be connectd to dehydration bc it seems to go away after drinking more water), and daily discharge. He has no doubt in his mind that im NOT pregnant which calms me down. But I still get a little parnoid about it. I know this may seem ridiculous but im genuinely concerned and just need a good explanation of what could be happening. Since I'm new to all of these I thought maybe the overload in "sex" hormones is confusing my body. I've never been a sexual feely-touchy person until him and I decided to be together about a month ago. Please give your advice and opinions!