Ttc, period due in 2 days, neg test, waves of nausea, cramping, cramping after sex. could i still be pregnant?

Could be: You need to do a blood quantitative b- HCG it will be + before the first missed period.

Not likely: It's possible but not likely with a negative pregnancy test. Most commercially available pregnancy test shoud detect pregnancy few days before your expected period. However, you can repeat it in few days if you miss your period. Blood test is usually not any more accurate for your situation. There may be other reasons for your symptoms.