Pregnancy Scare

Okay so, I’m think I’m having a pregnancy scare.

1. I had sex with protection the last times I’ve had sex.

2. Because I was worried we didn’t use protection the previous time before the last three times, I took a plan b.

3. After taking plan b I got my scheduled period (two weeks after pill) , then I got my period again one week. (I got two periods)

4. I’ve had spotting the past 2 days but it’s light, only comes out when i wipe.

Probably just irregularities from plan b right? Or should I go pick up a tesr