is possible only,if unprotected sexual intercourse is done with ejaculation around ovulation time in regular period.Other days are low risk with variable failure rate.
Wait for the coming period as your due date is 24th and if missed then do a urine test for B-hcg
after 1 wk to confirm/exclude pregnancy.
Your features are suggestive of some sort of indigestion
prob. Take some medicine like PPI or anti emetic to get some relief.
Control body wt,take healthy diet,avoid stress
and sleep properly.