Could I be pregnant

Not sure if i should check up on this or if I’m totally just overthinking.

Recently I just had my period and it was a lot different that it usually is. It was super light and would occasionally stop as if it was the end of my cycle. It officially ended 3 days ago.

I also have very sore breast ( something that has never happened before ) and threw up once in the middle of the night. I’ve had very bad headaches as well. I have not been sick or have any symptoms of a cold.

The glow app had predicted a 3% change of me getting pregnant the day I did have sex (October 9th). But I also had a prediction of 25% on september 29th And my boyfriend came during both.

Can anyone help ?