,can be detect in medical if you are pregnant,if...

Can be detect in medical if you are pregnant,if only 7 days before last sex ?
pregnancy detection doesnt depend on last day you had sexual intercourse , but it depend on which day of period is it 
What is the options of pregnancy tests ?
1. HCG hormone level blood test
2. home pregnancy test ( urine ) 
3. ultrasound test ( in clinic ) 
How early can you do those tests :
1. HCG hormone test : 25th day of the current period
2. home pregnancy test : first week of the next period 
3. ultrasound test : second week of the next period 
Early pregnancy signs :
1. delayed period 
2. increase vigainal discharge 
3. abodiminal discomfort 
4. change in mood status