Pregnant if i had sex with a condom after my periods.

If you used the condom correctly and it didnt break or have a hole in it you should not be pregnant. If your really worried about becoming pregnant I would suggest using two birth control methods. Keep using condoms(with spermicide which kills sperm) and you can start a method which includes birth control pills, a ring you insert, mirena(this can be used up to 5 years and removed at anytime when your ready to conceive), and depo shot(which is given every 3 months).  Also ovulation is usually around 2 weeks after the first day of your period if your periods are regular. Sperm can live in the vagina up to 3 days so around the time of ovulation you may want to make sure to avoid him cumming in you but pre cum also has sperm in it also.

Sometimes i get this pregnancy symptoms like vomiting and lil cramps betwwen my tummy and virgina. Would it a stress that i am having or what ?

I would say it is stress. Stop thinking about it and it will probably go away. If your period is over a week late take a pregnancy test but im pretty sure your not pregnant because the condom didn't fall off or break during sex.