Body sending weird signs

so I've been pregnant twice before, two amazing little girls. I think I know what it's like to be pregnant. My period is due sometime next week, like 5-6 days. starting last week I starting having pelvic pain, dizziness and slight nausea and back pain as well as slight spotting. This week the nausea is hitting me as soon as I wake and then randomly in the day, my breasts, around my nipples are extremely sore and I'm having very slight brownish-pink discharge just when I wipe and only like twice a day. I'm having cramps really low near my pelvis and lots of fatigue. I usually get tender breasts and cramps a day or two before my period, but, this is way earlier than expected. I took an off brand test today and it came back negative. With my second daughter I had like 4 negatives before I had a positive. I just have a hunch. I bought 2 First Response tests to take this weekend and early next week. Anyone else have anything out of wack like this? I feel like my body is going haywire.