Is it true??

Ok so I'm not really sure what to think/do. Me and my husband have been trying to conceive for a few months now (actively trying) and I was late by a day starting my period. I am normally like clockwork. Then the following day I started to bleed, and I bled very heavy for 3 days and continue to bleed for a whole week. This is very unlike me. Normally I bleed heavy for day 1 and then very light and then spotting and no more than 5 days. So I found all this really odd. The thing is the blood was different, it wasn't like menstrual blood. Anyway I have been trying to lose weight and I've been getting frustrated the last week as I've been putting some weight on and I have been incredibly good with what I am eating etc, so I found this very annoying. This morning I noticed that my breasts were really tender, so I decided just because I had a test in the bathroom that I would see what it said and a much to my amazement a line appeared. This afternoon I bought a digital test and that says I am 2-3 weeks pregnant which coincides with my fertile week!!!!
Has anyone experienced heavy bleeding and found out that they are pregnant as I'm confused. Does it mean I miscarried, I don't know what to do. Please help. X
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