I had my tubes tied but am feeling like I may be pregnant...

Hello Everyone, I got my tubes tied almost 3 years ago, after my dd was born. Since I had my tubes tied I haven't really been too careful keeping track of my periods (didn't feel I had to be). The last period I can remember I had was in Dec. but my husband says I had one after that. When I think back, it seems like my periods have always been regular. If I had my last period in Dec. it was the beginning of the month....so that means I am late. But if my husband is right (really starting to think he is) that means I shouldn't be starting until the beginning of Feb. As of right now I am having symptoms that could either be PMS or pregnancy symptoms. I've been having some cramping that feels a lot like PMS cramps....but haven't started yet. I've also had some spotting yesterday and today that is only there when I wipe. Usually when it's that time of month I start off with cramps and then a day or so later I start. When I first start it's always more than just spotting. Today I seem to be bleeding a little more, but nothing like I normally do. Since I noticed more blood when I wiped, I put a pad on but there's not too much blood on it. It started out a light pink color but has been getting darker. I'm assuming that it's my period but I'm still not too sure. I am still having the cramping, which usually goes away either right before I start or right after. I feel a lot more bloated than normal, my breasts are bigger but aren't sore, I've been a little nauseas yesterday and today, this morning I got a headache that's different then other ones I've had before, my body is a little achy this morning and I've been peeing a lot more lately. Another thing I noticed was more of a wet feeling, which made me think I started my period. I doubt I am pregnant since I've started bleeding a little more, but I just wanted to find out if maybe anyone else has gone through something similar. I know that with having my tubes tied it is pretty unlikely that I am pregnant but I just really feel like I could be. I've been going crazy thinking about this. I've always regretted getting my tubes tied and have actually been thinking about getting it reversed. So I am really hoping that I am pregnant. I am trying really hard not to get my hopes up but it's hard when I have been feeling the way I have. I have 4 kids already and had these same feeling when I was first pregnant with them. The only thing different is the spotting. I'm sure that it's just my period but I feel different than I normally do, so it's hard not to think that I may be pregnant. If anyone has had a similar experience or any insight they would like to share, that would be great! Thank you for taking the time to read this.....sorry it was so long. I hope everyone has a great day.