Are these pregnancy symptoms or is it in my head?

I'm due to have my period on Tuesday. My husband and I weren't trying to conceive but to my calculations if I am pregnant ( got 2 negatives at 7dpo and 8dpo.. If I ovulated on day 14 as I usually do.) I would be around 3w 4 days pregnant. With my boys I had really bad headaches before I knew I was pregnant, very visable blue veins on my breasts, crampiness and fullness in my pelvic area but the morning sickness never came until around 5 or 6 weeks. I haven't tested since 8 dpo and decided not too until Tuesday if af doesn't arrive but right now the symptoms I'm experiencing are: visible blue veins on my breasts, breasts are def bigger, mild headache, crampiness, fullness in my pelvis area with twinges every once and awhile, heartburn ( which I dint usually get until much later on) and nausea. And I have a gut feeling I am. And I just wanted to mention that the only pms symptom I experience is headaches. Just wanted some opinions from all you mothers and mothers to be out there! :)