Confused..but excited

My husband and i have been ttc for about two years with no luck..i finally went and seen a fertility doc and i had the hsg test done earlier this month..i expecting AF on the 26th of this month it came a day late on the 27th i was so disappointed..but yesterday morning and this morning i woke up feeling very nauseous and started to vomit. So today i took a pregnancy test and it come back positive but the line was faint..what does this mean