My lower abdomen is very hard when I stand up

Patient: My lower abdomen is very hard when I stand up but when I lay down, it goes flat.I had sex 8 weeks ago and i did it right before my period started. I had my period at the right time the next month but it lasted for two days. I still had my period on the next month and it lasted for 4 days. I have been suffering from constipation too and lower abdomen pain since the last time i had sex although the pain has gone now. Plus i feel dizzy sometimes. Can i be pregnant?

Doctor: