Need your help ladies!

Ok here is the situation. We have been trying to conceive for about 4 months now. Ive felt so weird this month! Of course I have baby fever and the thought of being pregnant never leaves my mind. I felt weird about sleeping on my stomach or anyone even remotely touching my stomach. I took a dollar tree hpt the day before AF. It came out negative but now I'm thinking what if I missed a very faint line? I'm 2 days late. I just had sex and I went to the bathroom of course and I saw some spotting. Could this spotting be from sex or getting my AF orbe because I'm pregnant. I NEVER spot when starting my AF Just want to know your thoughts! Thanks in advance!