I’m confused

About almost 3 months ago I started getting weird periods.. one time had it 3 times in a month but some would last 3-4 days. Last month I finally had a normal one started the 26th it always started like that. Then this month the 10th... remind you I ALWAYS had normal periods. I’ve been on the pill for 4 years. And nothing effected my period. Now I’ve been feeling BLOATED and feeling like crap it’s like my stomach has reached its max on bloated. And I feel nauseated like everyday. I didn’t get my period the 26th again. This is just weird for me.. I took a test a week ago and I posted it. A lot of people said maybe and a lot said invalid to test again. So I’m asking what’s going on! I’ve looked it up and first thing that pops up “pregnancy”. Idk.. 😕 I’m also on the pill norethindrone. I’m usually good with taking them the same day everyday I have an alarm on my phone but sometimes I forget my pack at home and if I’m out I can’t take it on time so sometimes an hour or 2 late. One time it was a day or 2.