About 7 dpo i started feeling fatigued daily, tender boobs/nips, craving certain foods, etc. cervix is low/firm, 1 day late (period is always on time). took hpt, bfn. could i be pregnant?

May be: It may be too early for a negative hpt to exclude pregnancy. Repeat the test in 4-5days. If it is still negative, re do it 4-5 days after that, unless you get a period by then. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex. Get HPV vaccine.