Ttc w/ hus.ovulated 4/6 had sex4/7,4/8.supposedd to get period 4/18.still havent gotten in but preg test came neg.could i still be preg and 2 early?ty

Can repeat HPT in wk: Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds, Illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., PCOS). Pregnancy is #1 reason.