Could i be pregnant??

Gloria
Hey everyone! My name is Gloria, i had my fertile week last week but the peak fertility day yesterday as this app tells. I had sex last week and yesterday.. But the last 3 or 4 days iv been almost throwing up every morning and iv been feeling like im walking on clouds, not great apetite, sour breasts.. and so on.. 
I took the ovulation test every day this week and it told me that i was as most fertile yesterday... To my question 👉🏼👉🏼 Could i be pregnant from last weeks sex even if the test said that i had peak fertility yesterday?