Possible miscarriage, but wait!!!

Haven't had a period in 6 months, last week noticed my boobs started to get sore and felt nauseated couple of days in a row. Took my first test, faint positive line. Took 6 in total, 4 faint positives. The later 2 were negative. Could I have had a miscarriage? I haven't bled any, not even spotting. I've been cramps feeling as well. So confused. After my son was born I stepped down from my position at work and lost my benefits so I don't have insurance or money to go to the doctor. I don't feel life threatening enough to sit at the E.R. ugh.......HELP