I bled for a few days for my first "missed" period with my son. I could have easily mistaken it for a period but i normally have a very heavy flow that lasts a week so I knew it wasn't rite. So it's very possible.
Back pain has also been my first "symptom" this time around and it killed me!! Thank god now it's gone since I stopped picking up my daughter as much lol. She just walks everywhere now. And most people say the second pregnancy is different. It has been for me somewhat. I still crave around the same stuff but I'm definitely showing a lot faster. So nothing is too early. Anything is possible after the first!
Definitely! They went off my period and I was around 7 weeks but the ultrasound said I was 11 weeks!! So it's definitely possible.
PS....
And today I have been having cramps that come and go .. And back pain ?