First time TTC

Ok ladies, my husband and I had unprotected intercourse on August 28 LATE at night. I had EWCM the next day. September 1-3 had menstrual like cramps and low back ache off and on. I have never had cramps unless my period came along with it. Stopped using Nuva Ring late April so my cycles have been 30, 23, 26, and 24 days. So not too consistent obviously. My period is due today. Usually the only true symptom I have is cramps and then get my period 30 minutes to an hour later. Got excited and tested at like 1 am this morning and came back negative. Last night we went out to eat and I had a couple glass fills of iced tea. Wondering if my urine was too diluted or still to early to test and if it's possible I could still possibly be pregnant? Sorry for the annoying question, just new to this! Thanks in advance!