You wouldnt be getting symptoms like that this early.its not a sign of pregnancy.as for your cervix,you cant tell if your pregnant by this,wait to se if you miss your period.whilst its possible to get pregnant by having sex on ovulation day,the ideal situation is to have it before also.since the egg is only viable for several hours not the hole day,so can be easy missed.
You cannot tell if you are pregnant by your cervix. It changes day to day and even hour to hour. The only way to know is by a positive test. No one here will be able to tell you if you are.
I really think the best thing you can do is wait until your period is due and then test. We all look to signs in pregnancy but pms can be alot like pregnancy signs. I really hope that it all works out for you :)