Hello dear,
I understand your concern.
In my opinion there is no chance of
pregnancy in your case.
Following are the factors which make the pregnancy unlikely :-
1)The 3 days before the period comes under safe period where the chances of pregnancy are nil.
2)You have got the periods already.
Once the periods come the chance of pregnancy is ruled out.
Also other symptoms of pregnancy like
nausea,vomitings,increased urination,sore breasts start 2 weeks after missed period.
And the vomiting which you had a day after intercourse is not due to pregnancy but for some other reason.
And
stress regarding the thought of pregnancy also make one to feel the pregnancy symptoms.
So relax.Avoid stress.
There cannot be pregnancy in your case.
Hope this helps.
Best regards...Dr.Srilatha