Implantation Bleeding?

[BabyxandxBub]

Hi, Please help, I'm scared! I'm on birth control and me and my partner normally use condoms but we decided to try having intercourse without condoms. I had a period on 6th June, and we had sex around the last couple of days of my pill which was around the 29/30th May. On Sunday I get this brown tiny clot in my underwear but nothing when I wiped, and I had it again once yesterday and again twice today. I'm not due on my period for another week or so, so it can't be that. We're both 19. Could I be pregnant? I have been feeling moody, my breasts are sore, needing the toliet a lot more, heightened sense of smell etc..I have a strong feeling I am, but my partner isn't convinced! Is there anyone who has experienced this so early?

 

[BabyxandxBub]

So I took a first response test yesterday afternoon and came up clearly positive, not faint or anything, and then I bought another first response test today just to make sure and did it this evening and it came out pure negative?! Is there 2 different types of first responses? The one I did yesterday had the writing "pregnant" "not pregnant" by the side of it and the logo on the end of the test was different to the one I did yesterday. So I'm wondering could it not be sensitive enough to detect my hormone level? Its very rare to get fake positives if at all. ? Any advice?!