I don't think the aspirin is neccesary. If your too scared to take an HPT, then get over it. Go buy one, wake up in the morning, and pee on it. Very simple. You will know if you are pregnant or not within 3 minutes. It is easier to deal with when you know what is going on....
well go and get a HPT, you will have to face the fact regardless. And I would not suggest taking the asprin and soda, if you are pregnant too much caffeine can be harmful!!!!