Should i retest?

KIMBERLY

So i had sex on the second and third day of my period in April then had sex 2 days after i ovulated.. i took 2 pregnancy test welhen i was 1 day late then 2 more the secand late day all negative im now 8 days and i still haven't gotten my period .. the past 3 days ive been feeling sick to my stomach like randomly get nausea.. do u think i should retest.. could I be pregnant