pregnant?

My period is late by 19 days and I'm concerned that I could be pregnant. I've been really tired lately and my nipples have been tender and sore to the touch but not the rest of my breasts which I find weird. And I've been feeling sick to my stomach a few times throughout the day but I haven't been having an appetite when I eat so I wonder if it's been because I haven't been eating as much as I usually do. I've also been getting cramps since the first of may but my period doesn't show up, each time I feel something it ends up being a lot of discharge but no period. I'm genuinely concerned.