Pregnant or period

So I’m dumb and had unprotected sex on Monday (3 days ago). He said he didn’t cum in me because he pulled out. It’s been 3 days and I have had some cramps and right now when I used the restroom there was a bit of blood, like spotting. I haven’t had my period since I just had my 2nd baby almost 8 weeks ago. So now I’m wondering can I be pregnant this soon or is my period returning already? I’m breastfeeding for the most part (2 pumps a day) so I didn’t think it’d come back this early but idk. Should I take a test?