Negative Pregnancy Test/ 77 Days Late

Ladies,

Have any of you experience negative pee pregnant tasting results, but have had almost all pregnancy symptoms ?

My last period was on 9/ 12. My partner and I had unprotected sex 10/18 a week before my projected start period, my cycle average was 44 days

Three days after sex, I had red/brown light spotting one day and the next day very minimal spotting. Not enough to say it was my period. And it only happen two days in a row.

A week after, my body begin to feel different;

•my breast became so sore

•very sensitive nipples

2 weeks after;

•slight cramping

•backache

• tired and very sleepy. (Really rare for me)

•nausea

•weird food cravings

•tiny bumps on my nipples

•dizzy spells

Today marks 5 weeks since the act and yet no period, and negative results.

Could I be pregnant and my HGC levels are just low ? Or could this be a health issue ?