Pregnant ?

What are the chances I could be pregnant. About 7 weeks ago I had sex I have Ben on the birth control arm implant and we used a condom but ever since a week after it happen I have felt sick to my stomach I feel bloated and my boobs are just now sore. I was on my period when we had sex 5 days went by I stopped then a few days later I started again. I was suppose to get my period like 5 days ago  yet it could just be the birth control starting to work it just kinda worry a me 🙁