Advice needed! Early pregnancy?

Hey guys! I'm posting this looking for advice than anything. So, I've always had pretty irregular periods. Last period I went almost four months without one, I was put on a 10 day supply of birth control to induce it. It worked, and it's been about 22 days since it ended. I've been getting very nauseous the past week, more so when I first wake up and occasionally throughout the day, but I haven't vomited. I'm also getting slight cramps that feel like menstrual cramps, and also persistent, mild to moderate stabbing pains around my bellybutton area that come and go pretty often, inside of course. I'm very tired also, and feel a like I'm living in brain fog. I've had no bleeding at all. I'm just curious as to what your earliest signs of pregnancy were and when they first started appearing. I'm not sure whether it's my body getting prepared for my next period or whether I may be pregnant. Any information helps! Thank you!