could i have a baby in the oven.

hi, everyone this is my first time posting.

I had sex about a week before my period with protection. I know protection doesn't always work. my period was to come on Sat 14,2018. it come 3 days earlier and only for 2 days it was a lot for does 2 days. then it stop. I always have my periods for 4-5 days. and I'm never 3 days early. my period is always every 28-29 days. so I'm a little worried about it. it's not that we don't want kids. it's just that we didn't want them right now. but if I am the baby will be welcome.