Pregnancy Scare

I’m hoping for some input/guidance. I’ve been having unprotected sex. I haven’t had sex since before my son was born (4 years+). I haven’t been tracking my period because well I didn’t have anyone in my life until recently.

On Monday, my nipples were super sore but haven’t bothered me today. When I took off my bra for the night, the tips of my nips have little white spots on them so I gave them a squeeze when colostrum came out. I breastfed my son but unfortunately dried up when he was 8 months… Can someone please tell me I’m being paranoid?!