It could be that maybe you ovulated a little earlier than you thought. Normally you would ovulate about 10-14 days after the first day of their cycle which could me that it would of already implanted.
ok i just dont rem or kowing i had this problem with my first 2 pregncies
my period was 3 days early i started on the 14th and ended on the 19th. according to ovulation calendars i was to ovulate on the 28th
Honestly it would be too early to really be getting an pregnancy symptoms since it wouldn't have implanted yet. Those feels could be caused by a lot of different things. I know that a lot of times when I would think that I was pregnant I would get these weird fluttery feelings.. Only thing you can really do is wait 2 weeks and test.
is there other reasons for the cramping and pulsation
It usually takes about 5-7 days for the baby to implant.