It's Been 11 Days Since Ovulation And Me My Husband

It's been 11 days since ovulation and me my husband had sex fours day after I have been really tired and craving and and the last three days my vagina walls are really swollen and tight could I be pregnant I am not sure if I should take a pregnancy test Now I am afraid it might be too soon and I am apossed to start my monthly on the 18 is it too soon?