Good morning. On day 20 of my cycle I felt like getting a blood test f…

Good morning. On day 20 of my cycle I felt like getting a blood test for hCG. Day 20: 35 mIU/mL Day 21: 41 mIU/mL On day 20 of my cycle, I went for an ultrasound (there's obviously nothing visible there, well, what did I want at this stage? ?). The doctor said - there's nothing, you'll come back in 2 months on day 5-7 of your cycle. Today is day 22, tomorrow I'll re-test the hCG. My lower abdomen feels heavy and I feel nauseous. Could it be pregnancy?