I'm Very Concerned About What Wrong With Me.. I Have

I'm very concerned about what wrong with me.. I have zero idea but basically about 3 months ago my mom insisted I was pregnant and I had told her no I am not but she still insisted on she really thinks I am but the thing is I have gotten my period every month , I'm extremely normal but for the past 3 haven't been the first period was not light but not too heavy and lasted 5 days and i had thought I missed my period the next month but it came a week late lasted 3 days and was still not light but not heavy and then this month I was also a week late but it was extremely light lasted for 7 days then on the 8th day there was nothing until the evening the all of a sudden there was a little bit of blood but literally like just 2 drops of blood zero clots or nothing it was really weird , I have felt movement in my stomach for the past 2 weeks and can even feel and see it outside of my stomach and weird times but this has only happened about 4 times I have went back and fourth from diarrhea and constipation sometimes feel like I have to breathe way more face paced like I have to catch my breathe or something my skin has become dry on some parts of my body like my legs and lower stomach , I've felt vibration in my foot for the first time last month and I've felt only my thumbs get a weird tingly typa thing , acne has started to go on my face and back and even my arms which is suppeerrrr weird since I've never in my life had acne I weighed 140 before the 3 months got extremely nasues the first month to where I had trouble eating or drinking because instantly I would go and vomit I lost my appetite hated pizza and still do but that went away after about 2 weeks but I dropped to 130 and then I got all the way down to 117 but I'm slowly gaining weight right now and am at 125 , I'm only 5'2 tall so I'm small but at my work the other day one of my coworkers happened to randomly touch my stomach and told me I'm putting on some weight , but I'm steadily at 125 haven't gained or lost weight in the last 2 weeks besides going back and fourth from 120-125 , my stomach is starting to feel hard and my coworker was telling me if I'm possibly pregnant I told her there was no way but her saying that made me question it.. I've had a blood test done at the end of August and have taken 5 pregnancy tests after that today was the 5th one and all were negative.. I don't understand what's going on and I'm scared it's something seriously wrong but there is also a possibility of false negatives but it makes no sense to why I would be able to feel this if I'm giving negatives is there any other serious problem that can be occurring ?? Or is it more of a possibility to be getting false negatives ?? I'm extremely confused....