Pregnancy or somethink eles ???

I came off the coil just over a month ago an I've not had a period yet an me an my husband had 2 accidents were the condom come off in side an there wasn't anythink in them both times so the cum went in me an this happened on the 4th an 6th an I just went to the toilet an the was a very liltte bit of bright pink in the loo roll an I'm getting a bit parra that it could be implantation could it happen this soon ? An about a day or 2 i got a painful sharp feeling on my left side an I'm parra incase pre as gone in as we have been doing without the condom first an then putting it on at the last minute ?