TTC #1, poss. 18 dpo, can i be preg w/ BFN still?? Im not pos. when I ov'd...?

im in the same situation as you - i am currently 5 days late (roughly 19dpo) for my period (i have an appt with my doctor on thurs). A week ago i had strong period like cramps & low back pain but no period no spotting at all - but here I am still no period. Im hoping that i am pregnant, but i did a test (first response) yesterday and got yet another negative result! So either my cycle is way irregular this month or there is something wrong with me! I've been feeling nauseas (