Should I test again???

I'm 15dpo and 2 days late on my period. My period is usually right on track. Me and my boyfriend started ttc this month.

I'm having symptoms that could lean either to my period or being pregnant. I've been a little crampy the past couple days. Though it's not consistent cramps itll be like 5 minutes of some cramps and 3 hours of nothing. I've also had some cramping in my back. My breast dont hurt just my nipples are very tender and I dont have sensitive nipples at all normally. Also I've had a wicked loss in appetite when i do eat I end up getting queasy or it just taste blah. I've got this cold I cant seem to get rid of. Everyone else I know that got sick after me are already all better. Also in either extremely hot or freezing cold no in between.

I took a first response test last night and it was a negative. Thinking back though idk if I submerged the tip far enough in to the urine.... or it might be to early. Or I'm not pregnant and it's all in my head. I don't know if I should test again or not and if so how soon???