Hey ladies, so I’m nervous and think I may be pregnant can anyone help?

I’ve been have nausea on and off, my breasts have been very sore, my last period was very weird, it was late and only lasted 3 days. A small history note: I was on a bc that worked perfectly for me but I switched to the bar but it didn’t work for me, so I went back to the pill in early February everything picked up where I had left off so I don’t think that the pill is having any effect on this situation. If anyone has any advice I would really appreciate it!!! Thank you!