Really need some answers or if this happen to you comment

So I’m a bit worried my baby was born 6 almost 7 weeks ago I had a very very easy labor and healed about 1 and a half weeks after I bled for about 3 weeks which. I know is normal when it stopped at 4.5 weeks I had a check up and ultrasound and said I could start having sex if I was up for it so me and bf have done it about 6 times with no condom (I really thought u couldn’t get pregnant if u have milk coming out, I’m not breast feeding tho! So now fast forward I thought my period was gonna start I was having some pretty bad cramping that felt like my period and now I stopped cramping complete but am very very lightly spotting? And have blood tinged mucas coming out randomly? And super yellow sticky cm? I got it checked no infections so Idek is that normal to complete stop bleeding then a week or so later start very small and light pink spotting? And blood tinged mucas?