NO RUDE COMMENTS!! in need of some advice

Zoe
I have a question, i just had a baby March 2nd, 2017. I know your supposed to wait to do any intercourse until after 6 weeks but my husband and i have done it 3 or so times after 2 1/2 weeks PP. starting 3 days ago i started just spotting. Not enough for a pad, but just to wipe. Its been on and off. Any idea that it could be another pregnancy? Implantation bleeding? Im not scared nervous, just wanna see what other mama's think about this or if they have been through the same thing. Just in need of some advice. My boys are 5 years apart and never have been through back to back pregnancy.