Am I having pregnancy symptoms or wishful thinking?

Here's all the gritty tmi you might need! I had my period about a week ago, but it was a little early and only 2 days- where I am usually pretty regular and normally 4-5 days. The first day was kind of heavy but after that, it was really light. I didn't have anymore bleeding for about 3 days and thought I was done with it so I stopped pantyliners and went back to wearing my favorite underwear! Loe and behold if I don't use the bathroom 3-4 days after getting off my period and find light blood staining in my favorite underwear and light pink smears on the toilet paper. I didn't stain anymore but I did have a little tissue spotting for a few hours. Since then, I have been painfully constipated (not now) and I just have that 'feeling' that something in my tummy is going on. I have been bloated and crampy ever since I found myself spotting and at times the cramping is downright uncomfortable. I also get these weird feelings,like twinges, every once and awhile in my belly, here and there that disappear as quickly as I notice them? I'm sorry, I'm not sure how to describe a 'feeling'! More than anything else, I find myself crying or ranting over the stupidest things! Usually one right after the other and it's driving my hubby insane! The other night, when I took my bra off to go to bed, my boobs felt tingly and uncomfortable for a little while (but I had been wearing it all day! Maybe they were just relieved, lol) All of that makes me wonder but three things make me think it may all be in my head: -We always use condoms, start to finish and never had any problems with them. -I took a home test the day of my spotting, negative -my sister in law is pregnant, so I think her situation may have just put the 'idea' in my head.