Delayed Periods, HPT Negative. Transvaginal Shows Anteverted Uterus. Having Cramps, Sensitive Nipples, Headaches

I am 25 days delayed in my period.i tried hpt during my 6th, 8th and 11th day of delayed and came back negative. on the 12th day, I decided to go to my ob, she did the IE and I had my transvaginal done. these was the finding Uterus 4.7 x 4.4 x 4.8 anteverted. Endometrium 0.71 triple line. Adnexal Right Ovary 3.0 x 2.2 x 2.6cm Lateral, Left Ovary 2.5 x 1.2 x 2.9cm posterolateral. Cervix 2.7 x 2.8 x 2.8cm None. Others: No fluid in the cul de sac. Diagnosis: Normal sized anteverted uterus, Trilaminar endometrium, Normal Ovaries. Today I am 25days delayed. LMP was Set.25-27, I just noticed that on my 14days of delayed(nov.8) I had one dot spotting on my undies like light brown, I had menstrual like cramping that s why I assumed that I will have my period anytime last week. I also had some clear white discharge, sensitive nipples but not tender or sore boobs. headches, backaches and stomach cramps. whats these can possibly be?